diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -89,10 +89,12 @@
       // Fail for an invalid base (required by POSIX).
       return nullptr;
 
+  // Current offset into the original string to reflect in EndPtr.
+  size_t Offset = 0;
   // Strip leading whitespace.
-  for (unsigned i = 0; i != Str.size(); ++i)
-    if (!isSpace((unsigned char)Str[i])) {
-      Str = Str.substr(i);
+  for ( ; Offset != Str.size(); ++Offset)
+    if (!isSpace((unsigned char)Str[Offset])) {
+      Str = Str.substr(Offset);
       break;
     }
 
@@ -108,6 +110,7 @@
     if (Str.empty())
       // Fail for a sign with nothing after it.
       return nullptr;
+    ++Offset;
   }
 
   // Set Max to the absolute value of the minimum (for signed), or
@@ -127,6 +130,7 @@
           return nullptr;
 
         Str = Str.drop_front(2);
+        Offset += 2;
         Base = 16;
       }
       else if (Base == 0)
@@ -167,7 +171,7 @@
 
   if (EndPtr) {
     // Store the pointer to the end.
-    Value *Off = B.getInt64(Str.size());
+    Value *Off = B.getInt64(Offset + Str.size());
     Value *StrBeg = CI->getArgOperand(0);
     Value *StrEnd = B.CreateInBoundsGEP(B.getInt8Ty(), StrBeg, Off, "endptr");
     B.CreateStore(StrEnd, EndPtr);
diff --git a/llvm/test/Transforms/InstCombine/str-int-4.ll b/llvm/test/Transforms/InstCombine/str-int-4.ll
--- a/llvm/test/Transforms/InstCombine/str-int-4.ll
+++ b/llvm/test/Transforms/InstCombine/str-int-4.ll
@@ -35,107 +35,118 @@
 @x32max = constant [12 x i8] c" 0x7fffffff\00"
 @i32max_p1 = constant [12 x i8] c" 2147483648\00"
 
-@ui32max = constant [12 x i8] c" 4294967295\00"
-@ui32max_p1 = constant [12 x i8] c" 4294967296\00"
+@endptr = external global i8*
 
 
 ; Exercise folding calls to 32-bit strtol.
 
 define void @fold_strtol(i32* %ps) {
 ; CHECK-LABEL: @fold_strtol(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @ws_im123, i64 0, i64 10), i8** @endptr, align 8
 ; CHECK-NEXT:    store i32 -123, i32* [[PS:%.*]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @ws_ip234, i64 0, i64 10), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS1:%.*]] = getelementptr i32, i32* [[PS]], i64 1
 ; CHECK-NEXT:    store i32 234, i32* [[PS1]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @i0, i64 0, i64 2), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS2:%.*]] = getelementptr i32, i32* [[PS]], i64 2
 ; CHECK-NEXT:    store i32 0, i32* [[PS2]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @i9, i64 0, i64 2), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS3:%.*]] = getelementptr i32, i32* [[PS]], i64 3
 ; CHECK-NEXT:    store i32 9, i32* [[PS3]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @ia, i64 0, i64 2), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS4:%.*]] = getelementptr i32, i32* [[PS]], i64 4
 ; CHECK-NEXT:    store i32 10, i32* [[PS4]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @i19azAZ, i64 0, i64 6), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS5:%.*]] = getelementptr i32, i32* [[PS]], i64 5
 ; CHECK-NEXT:    store i32 76095035, i32* [[PS5]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @i32min, i64 0, i64 12), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS6:%.*]] = getelementptr i32, i32* [[PS]], i64 6
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS6]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @mo32min, i64 0, i64 14), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS7:%.*]] = getelementptr i32, i32* [[PS]], i64 7
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS7]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @mx32min, i64 0, i64 12), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS8:%.*]] = getelementptr i32, i32* [[PS]], i64 8
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS8]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @mx32min, i64 0, i64 12), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS9:%.*]] = getelementptr i32, i32* [[PS]], i64 9
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS9]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @i32max, i64 0, i64 11), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS10:%.*]] = getelementptr i32, i32* [[PS]], i64 10
 ; CHECK-NEXT:    store i32 2147483647, i32* [[PS10]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @x32max, i64 0, i64 11), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS11:%.*]] = getelementptr i32, i32* [[PS]], i64 11
 ; CHECK-NEXT:    store i32 2147483647, i32* [[PS11]], align 4
 ; CHECK-NEXT:    ret void
 ;
 ; Fold a valid sequence with leading POSIX whitespace and a minus to -123.
   %pwsm123 = getelementptr [11 x i8], [11 x i8]* @ws_im123, i32 0, i32 0
-  %im123 = call i32 @strtol(i8* %pwsm123, i8** null, i32 10)
+  %im123 = call i32 @strtol(i8* %pwsm123, i8** @endptr, i32 10)
   %ps0 = getelementptr i32, i32* %ps, i32 0
   store i32 %im123, i32* %ps0
 
 ; Fold a valid sequence with leading POSIX whitespace and a plus to +234.
   %pwsp234 = getelementptr [11 x i8], [11 x i8]* @ws_ip234, i32 0, i32 0
-  %ip234 = call i32 @strtol(i8* %pwsp234, i8** null, i32 10)
+  %ip234 = call i32 @strtol(i8* %pwsp234, i8** @endptr, i32 10)
   %ps1 = getelementptr i32, i32* %ps, i32 1
   store i32 %ip234, i32* %ps1
 
 ; Fold " 0" in base 0 to verify correct base autodetection.
   %psi0 = getelementptr [3 x i8], [3 x i8]* @i0, i32 0, i32 0
-  %i0 = call i32 @strtol(i8* %psi0, i8** null, i32 0)
+  %i0 = call i32 @strtol(i8* %psi0, i8** @endptr, i32 0)
   %ps2 = getelementptr i32, i32* %ps, i32 2
   store i32 %i0, i32* %ps2
 
 ; Fold " 9" in base 0 to verify correct base autodetection.
   %psi9 = getelementptr [3 x i8], [3 x i8]* @i9, i32 0, i32 0
-  %i9 = call i32 @strtol(i8* %psi9, i8** null, i32 0)
+  %i9 = call i32 @strtol(i8* %psi9, i8** @endptr, i32 0)
   %ps3 = getelementptr i32, i32* %ps, i32 3
   store i32 %i9, i32* %ps3
 
 ; Fold " a" in base 16 to 10.
   %psia = getelementptr [3 x i8], [3 x i8]* @ia, i32 0, i32 0
-  %ia = call i32 @strtol(i8* %psia, i8** null, i32 16)
+  %ia = call i32 @strtol(i8* %psia, i8** @endptr, i32 16)
   %ps4 = getelementptr i32, i32* %ps, i32 4
   store i32 %ia, i32* %ps4
 
 ; Fold "19azAZ" in base 36 to 76095035.
   %psi19azAZ = getelementptr [7 x i8], [7 x i8]* @i19azAZ, i32 0, i32 0
-  %i19azAZ = call i32 @strtol(i8* %psi19azAZ, i8** null, i32 36)
+  %i19azAZ = call i32 @strtol(i8* %psi19azAZ, i8** @endptr, i32 36)
   %ps5 = getelementptr i32, i32* %ps, i32 5
   store i32 %i19azAZ, i32* %ps5
 
 ; Fold INT32_MIN.
   %psmin = getelementptr [13 x i8], [13 x i8]* @i32min, i32 0, i32 0
-  %min = call i32 @strtol(i8* %psmin, i8** null, i32 10)
+  %min = call i32 @strtol(i8* %psmin, i8** @endptr, i32 10)
   %ps6 = getelementptr i32, i32* %ps, i32 6
   store i32 %min, i32* %ps6
 
 ; Fold -INT32_MIN in octal.
   %psmo32min = getelementptr [15 x i8], [15 x i8]* @mo32min, i32 0, i32 0
-  %mo32min = call i32 @strtol(i8* %psmo32min, i8** null, i32 0)
+  %mo32min = call i32 @strtol(i8* %psmo32min, i8** @endptr, i32 0)
   %ps7 = getelementptr i32, i32* %ps, i32 7
   store i32 %mo32min, i32* %ps7
 
 ; Fold -INT32_MIN in hex and base 0.
   %psmx32min = getelementptr [13 x i8], [13 x i8]* @mx32min, i32 0, i32 0
-  %mx32min_0 = call i32 @strtol(i8* %psmx32min, i8** null, i32 0)
+  %mx32min_0 = call i32 @strtol(i8* %psmx32min, i8** @endptr, i32 0)
   %ps8 = getelementptr i32, i32* %ps, i32 8
   store i32 %mx32min_0, i32* %ps8
 
 ; Fold -INT32_MIN in hex and base 16.
-  %mx32min_16 = call i32 @strtol(i8* %psmx32min, i8** null, i32 16)
+  %mx32min_16 = call i32 @strtol(i8* %psmx32min, i8** @endptr, i32 16)
   %ps9 = getelementptr i32, i32* %ps, i32 9
   store i32 %mx32min_16, i32* %ps9
 
 ; Fold INT32_MAX.
   %psmax = getelementptr [12 x i8], [12 x i8]* @i32max, i32 0, i32 0
-  %max = call i32 @strtol(i8* %psmax, i8** null, i32 10)
+  %max = call i32 @strtol(i8* %psmax, i8** @endptr, i32 10)
   %ps10 = getelementptr i32, i32* %ps, i32 10
   store i32 %max, i32* %ps10
 
 ; Fold INT32_MAX in hex.
   %psxmax = getelementptr [12 x i8], [12 x i8]* @x32max, i32 0, i32 0
-  %xmax = call i32 @strtol(i8* %psxmax, i8** null, i32 0)
+  %xmax = call i32 @strtol(i8* %psxmax, i8** @endptr, i32 0)
   %ps11 = getelementptr i32, i32* %ps, i32 11
   store i32 %xmax, i32* %ps11
 
@@ -147,48 +158,48 @@
 
 define void @call_strtol(i32* %ps) {
 ; CHECK-LABEL: @call_strtol(
-; CHECK-NEXT:    [[MINM1:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([13 x i8], [13 x i8]* @i32min_m1, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[MINM1:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @i32min_m1, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    store i32 [[MINM1]], i32* [[PS:%.*]], align 4
-; CHECK-NEXT:    [[MAXP1:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([12 x i8], [12 x i8]* @i32max_p1, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[MAXP1:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @i32max_p1, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS1:%.*]] = getelementptr i32, i32* [[PS]], i64 1
 ; CHECK-NEXT:    store i32 [[MAXP1]], i32* [[PS1]], align 4
-; CHECK-NEXT:    [[IPLUS:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([3 x i8], [3 x i8]* @wsplus, i64 0, i64 0), i8** null, i32 0)
+; CHECK-NEXT:    [[IPLUS:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @wsplus, i64 0, i64 0), i8** nonnull @endptr, i32 0)
 ; CHECK-NEXT:    [[PS2:%.*]] = getelementptr i32, i32* [[PS]], i64 2
 ; CHECK-NEXT:    store i32 [[IPLUS]], i32* [[PS2]], align 4
-; CHECK-NEXT:    [[IA:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([3 x i8], [3 x i8]* @ia, i64 0, i64 0), i8** null, i32 0)
+; CHECK-NEXT:    [[IA:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @ia, i64 0, i64 0), i8** nonnull @endptr, i32 0)
 ; CHECK-NEXT:    [[PS3:%.*]] = getelementptr i32, i32* [[PS]], i64 3
 ; CHECK-NEXT:    store i32 [[IA]], i32* [[PS3]], align 4
-; CHECK-NEXT:    [[I8:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([3 x i8], [3 x i8]* @i8, i64 0, i64 0), i8** null, i32 8)
+; CHECK-NEXT:    [[I8:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @i8, i64 0, i64 0), i8** nonnull @endptr, i32 8)
 ; CHECK-NEXT:    [[PS4:%.*]] = getelementptr i32, i32* [[PS]], i64 4
 ; CHECK-NEXT:    store i32 [[I8]], i32* [[PS4]], align 4
-; CHECK-NEXT:    [[I0X:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([3 x i8], [3 x i8]* @x0x, i64 0, i64 0), i8** null, i32 0)
+; CHECK-NEXT:    [[I0X:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @x0x, i64 0, i64 0), i8** nonnull @endptr, i32 0)
 ; CHECK-NEXT:    [[PS5:%.*]] = getelementptr i32, i32* [[PS]], i64 5
 ; CHECK-NEXT:    store i32 [[I0X]], i32* [[PS5]], align 4
-; CHECK-NEXT:    [[IWSPWS0:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([5 x i8], [5 x i8]* @wsplusws0, i64 0, i64 0), i8** null, i32 0)
+; CHECK-NEXT:    [[IWSPWS0:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @wsplusws0, i64 0, i64 0), i8** nonnull @endptr, i32 0)
 ; CHECK-NEXT:    [[PS6:%.*]] = getelementptr i32, i32* [[PS]], i64 6
 ; CHECK-NEXT:    store i32 [[IWSPWS0]], i32* [[PS6]], align 4
-; CHECK-NEXT:    [[I19AZAZ:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([7 x i8], [7 x i8]* @i19azAZ, i64 0, i64 0), i8** null, i32 35)
+; CHECK-NEXT:    [[I19AZAZ:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @i19azAZ, i64 0, i64 0), i8** nonnull @endptr, i32 35)
 ; CHECK-NEXT:    [[PS7:%.*]] = getelementptr i32, i32* [[PS]], i64 7
 ; CHECK-NEXT:    store i32 [[I19AZAZ]], i32* [[PS7]], align 4
-; CHECK-NEXT:    [[O32MIN:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([15 x i8], [15 x i8]* @o32min, i64 0, i64 0), i8** null, i32 0)
+; CHECK-NEXT:    [[O32MIN:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @o32min, i64 0, i64 0), i8** nonnull @endptr, i32 0)
 ; CHECK-NEXT:    [[PS8:%.*]] = getelementptr i32, i32* [[PS]], i64 8
 ; CHECK-NEXT:    store i32 [[O32MIN]], i32* [[PS8]], align 4
-; CHECK-NEXT:    [[X32MIN:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([13 x i8], [13 x i8]* @x32min, i64 0, i64 0), i8** null, i32 0)
+; CHECK-NEXT:    [[X32MIN:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @x32min, i64 0, i64 0), i8** nonnull @endptr, i32 0)
 ; CHECK-NEXT:    [[PS9:%.*]] = getelementptr i32, i32* [[PS]], i64 9
 ; CHECK-NEXT:    store i32 [[X32MIN]], i32* [[PS9]], align 4
-; CHECK-NEXT:    [[X32MIN_10:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([13 x i8], [13 x i8]* @x32min, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[X32MIN_10:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @x32min, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS10:%.*]] = getelementptr i32, i32* [[PS]], i64 10
 ; CHECK-NEXT:    store i32 [[X32MIN_10]], i32* [[PS10]], align 4
-; CHECK-NEXT:    [[NWS:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[NWS:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS11:%.*]] = getelementptr i32, i32* [[PS]], i64 11
 ; CHECK-NEXT:    store i32 [[NWS]], i32* [[PS11]], align 4
-; CHECK-NEXT:    [[NWSP6:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 6), i8** null, i32 10)
+; CHECK-NEXT:    [[NWSP6:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 6), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS12:%.*]] = getelementptr i32, i32* [[PS]], i64 12
 ; CHECK-NEXT:    store i32 [[NWSP6]], i32* [[PS12]], align 4
-; CHECK-NEXT:    [[I0B1:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([3 x i8], [3 x i8]* @i0, i64 0, i64 0), i8** null, i32 1)
+; CHECK-NEXT:    [[I0B1:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @i0, i64 0, i64 0), i8** nonnull @endptr, i32 1)
 ; CHECK-NEXT:    [[PS13:%.*]] = getelementptr i32, i32* [[PS]], i64 13
 ; CHECK-NEXT:    store i32 [[I0B1]], i32* [[PS13]], align 4
-; CHECK-NEXT:    [[I0B256:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([3 x i8], [3 x i8]* @i0, i64 0, i64 0), i8** null, i32 256)
+; CHECK-NEXT:    [[I0B256:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @i0, i64 0, i64 0), i8** nonnull @endptr, i32 256)
 ; CHECK-NEXT:    [[PS14:%.*]] = getelementptr i32, i32* [[PS]], i64 14
 ; CHECK-NEXT:    store i32 [[I0B256]], i32* [[PS14]], align 4
 ; CHECK-NEXT:    ret void
@@ -196,90 +207,90 @@
 
 ; Do not fold the result of conversion that's less than INT32_MIN.
   %psminm1 = getelementptr [13 x i8], [13 x i8]* @i32min_m1, i32 0, i32 0
-  %minm1 = call i32 @strtol(i8* %psminm1, i8** null, i32 10)
+  %minm1 = call i32 @strtol(i8* %psminm1, i8** @endptr, i32 10)
   %ps0 = getelementptr i32, i32* %ps, i32 0
   store i32 %minm1, i32* %ps0
 
 ; Do not fold the result of conversion that's greater than INT32_MAX.
   %psmaxp1 = getelementptr [12 x i8], [12 x i8]* @i32max_p1, i32 0, i32 0
-  %maxp1 = call i32 @strtol(i8* %psmaxp1, i8** null, i32 10)
+  %maxp1 = call i32 @strtol(i8* %psmaxp1, i8** @endptr, i32 10)
   %ps1 = getelementptr i32, i32* %ps, i32 1
   store i32 %maxp1, i32* %ps1
 
 ; Do not fold " +".
   %psplus = getelementptr [3 x i8], [3 x i8]* @wsplus, i32 0, i32 0
-  %iplus = call i32 @strtol(i8* %psplus, i8** null, i32 0)
+  %iplus = call i32 @strtol(i8* %psplus, i8** @endptr, i32 0)
   %ps2 = getelementptr i32, i32* %ps, i32 2
   store i32 %iplus, i32* %ps2
 
 ; Do not fold " a" in base 0.
   %psia = getelementptr [3 x i8], [3 x i8]* @ia, i32 0, i32 0
-  %ia = call i32 @strtol(i8* %psia, i8** null, i32 0)
+  %ia = call i32 @strtol(i8* %psia, i8** @endptr, i32 0)
   %ps3 = getelementptr i32, i32* %ps, i32 3
   store i32 %ia, i32* %ps3
 
 ; Do not fold " 8" in base 8.
   %psi8 = getelementptr [3 x i8], [3 x i8]* @i8, i32 0, i32 0
-  %i8 = call i32 @strtol(i8* %psi8, i8** null, i32 8)
+  %i8 = call i32 @strtol(i8* %psi8, i8** @endptr, i32 8)
   %ps4 = getelementptr i32, i32* %ps, i32 4
   store i32 %i8, i32* %ps4
 
 ; Do not fold the "0x" alone in base 0 that some implementations (e.g.,
 ; BSD and Darwin) set errno to EINVAL for.
   %psx0x = getelementptr [3 x i8], [3 x i8]* @x0x, i32 0, i32 0
-  %i0x = call i32 @strtol(i8* %psx0x, i8** null, i32 0)
+  %i0x = call i32 @strtol(i8* %psx0x, i8** @endptr, i32 0)
   %ps5 = getelementptr i32, i32* %ps, i32 5
   store i32 %i0x, i32* %ps5
 
 ; Do not fold " + 0".
   %pwspws0 = getelementptr [5 x i8], [5 x i8]* @wsplusws0, i32 0, i32 0
-  %iwspws0 = call i32 @strtol(i8* %pwspws0, i8** null, i32 0)
+  %iwspws0 = call i32 @strtol(i8* %pwspws0, i8** @endptr, i32 0)
   %ps6 = getelementptr i32, i32* %ps, i32 6
   store i32 %iwspws0, i32* %ps6
 
 ; Do not fold "19azAZ" in base 35.
   %psi19azAZ = getelementptr [7 x i8], [7 x i8]* @i19azAZ, i32 0, i32 0
-  %i19azAZ = call i32 @strtol(i8* %psi19azAZ, i8** null, i32 35)
+  %i19azAZ = call i32 @strtol(i8* %psi19azAZ, i8** @endptr, i32 35)
   %ps7 = getelementptr i32, i32* %ps, i32 7
   store i32 %i19azAZ, i32* %ps7
 
 ; Do not fold INT32_MIN in octal.
   %pso32min = getelementptr [15 x i8], [15 x i8]* @o32min, i32 0, i32 0
-  %o32min = call i32 @strtol(i8* %pso32min, i8** null, i32 0)
+  %o32min = call i32 @strtol(i8* %pso32min, i8** @endptr, i32 0)
   %ps8 = getelementptr i32, i32* %ps, i32 8
   store i32 %o32min, i32* %ps8
 
 ; Do not fold INT32_MIN in hex.
   %psx32min = getelementptr [13 x i8], [13 x i8]* @x32min, i32 0, i32 0
-  %x32min = call i32 @strtol(i8* %psx32min, i8** null, i32 0)
+  %x32min = call i32 @strtol(i8* %psx32min, i8** @endptr, i32 0)
   %ps9 = getelementptr i32, i32* %ps, i32 9
   store i32 %x32min, i32* %ps9
 
 ; Do not fold INT32_MIN in hex in base 10.
-  %x32min_10 = call i32 @strtol(i8* %psx32min, i8** null, i32 10)
+  %x32min_10 = call i32 @strtol(i8* %psx32min, i8** @endptr, i32 10)
   %ps10 = getelementptr i32, i32* %ps, i32 10
   store i32 %x32min_10, i32* %ps10
 
 ; Do not fold a sequence consisting of just whitespace characters.
   %psws = getelementptr [7 x i8], [7 x i8]* @ws, i32 0, i32 0
-  %nws = call i32 @strtol(i8* %psws, i8** null, i32 10)
+  %nws = call i32 @strtol(i8* %psws, i8** @endptr, i32 10)
   %ps11 = getelementptr i32, i32* %ps, i32 11
   store i32 %nws, i32* %ps11
 
 ; Do not fold an empty sequence.
   %pswsp6 = getelementptr [7 x i8], [7 x i8]* @ws, i32 0, i32 6
-  %nwsp6 = call i32 @strtol(i8* %pswsp6, i8** null, i32 10)
+  %nwsp6 = call i32 @strtol(i8* %pswsp6, i8** @endptr, i32 10)
   %ps12 = getelementptr i32, i32* %ps, i32 12
   store i32 %nwsp6, i32* %ps12
 
 ; Do not fold the invalid base 1.
   %psi0 = getelementptr [3 x i8], [3 x i8]* @i0, i32 0, i32 0
-  %i0b1 = call i32 @strtol(i8* %psi0, i8** null, i32 1)
+  %i0b1 = call i32 @strtol(i8* %psi0, i8** @endptr, i32 1)
   %ps13 = getelementptr i32, i32* %ps, i32 13
   store i32 %i0b1, i32* %ps13
 
 ; Do not fold the invalid base 256.
-  %i0b256 = call i32 @strtol(i8* %psi0, i8** null, i32 256)
+  %i0b256 = call i32 @strtol(i8* %psi0, i8** @endptr, i32 256)
   %ps14 = getelementptr i32, i32* %ps, i32 14
   store i32 %i0b256, i32* %ps14
 
@@ -301,36 +312,40 @@
 
 define void @fold_strtoll(i64* %ps) {
 ; CHECK-LABEL: @fold_strtoll(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @ws_im123, i64 0, i64 10), i8** @endptr, align 8
 ; CHECK-NEXT:    store i64 -123, i64* [[PS:%.*]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @ws_ip234, i64 0, i64 10), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS1:%.*]] = getelementptr i64, i64* [[PS]], i64 1
 ; CHECK-NEXT:    store i64 234, i64* [[PS1]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([22 x i8], [22 x i8]* @i64min, i64 0, i64 21), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS2:%.*]] = getelementptr i64, i64* [[PS]], i64 2
 ; CHECK-NEXT:    store i64 -9223372036854775808, i64* [[PS2]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([21 x i8], [21 x i8]* @i64max, i64 0, i64 20), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS3:%.*]] = getelementptr i64, i64* [[PS]], i64 3
 ; CHECK-NEXT:    store i64 9223372036854775807, i64* [[PS3]], align 4
 ; CHECK-NEXT:    ret void
 ;
 ; Fold a valid sequence with leading POSIX whitespace and a minus to -123.
   %pwsm123 = getelementptr [11 x i8], [11 x i8]* @ws_im123, i32 0, i32 0
-  %im123 = call i64 @strtoll(i8* %pwsm123, i8** null, i32 10)
+  %im123 = call i64 @strtoll(i8* %pwsm123, i8** @endptr, i32 10)
   %ps0 = getelementptr i64, i64* %ps, i32 0
   store i64 %im123, i64* %ps0
 
 ; Fold a valid sequence with leading POSIX whitespace and a plus to +234.
   %pwsp234 = getelementptr [11 x i8], [11 x i8]* @ws_ip234, i32 0, i32 0
-  %ip234 = call i64 @strtoll(i8* %pwsp234, i8** null, i32 10)
+  %ip234 = call i64 @strtoll(i8* %pwsp234, i8** @endptr, i32 10)
   %ps1 = getelementptr i64, i64* %ps, i32 1
   store i64 %ip234, i64* %ps1
 
 ; Fold INT64_MIN.
   %psmin = getelementptr [22 x i8], [22 x i8]* @i64min, i32 0, i32 0
-  %min = call i64 @strtoll(i8* %psmin, i8** null, i32 10)
+  %min = call i64 @strtoll(i8* %psmin, i8** @endptr, i32 10)
   %ps2 = getelementptr i64, i64* %ps, i32 2
   store i64 %min, i64* %ps2
 
 ; Fold INT64_MAX.
   %psmax = getelementptr [21 x i8], [21 x i8]* @i64max, i32 0, i32 0
-  %max = call i64 @strtoll(i8* %psmax, i8** null, i32 10)
+  %max = call i64 @strtoll(i8* %psmax, i8** @endptr, i32 10)
   %ps3 = getelementptr i64, i64* %ps, i32 3
   store i64 %max, i64* %ps3
 
@@ -342,40 +357,40 @@
 
 define void @call_strtoll(i64* %ps) {
 ; CHECK-LABEL: @call_strtoll(
-; CHECK-NEXT:    [[MINM1:%.*]] = call i64 @strtoll(i8* nocapture getelementptr inbounds ([22 x i8], [22 x i8]* @i64min_m1, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[MINM1:%.*]] = call i64 @strtoll(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @i64min_m1, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    store i64 [[MINM1]], i64* [[PS:%.*]], align 4
-; CHECK-NEXT:    [[MAXP1:%.*]] = call i64 @strtoll(i8* nocapture getelementptr inbounds ([21 x i8], [21 x i8]* @i64max_p1, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[MAXP1:%.*]] = call i64 @strtoll(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @i64max_p1, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS1:%.*]] = getelementptr i64, i64* [[PS]], i64 1
 ; CHECK-NEXT:    store i64 [[MAXP1]], i64* [[PS1]], align 4
-; CHECK-NEXT:    [[NWS:%.*]] = call i64 @strtoll(i8* nocapture getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[NWS:%.*]] = call i64 @strtoll(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS2:%.*]] = getelementptr i64, i64* [[PS]], i64 2
 ; CHECK-NEXT:    store i64 [[NWS]], i64* [[PS2]], align 4
-; CHECK-NEXT:    [[NWSP6:%.*]] = call i64 @strtoll(i8* nocapture getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 6), i8** null, i32 10)
+; CHECK-NEXT:    [[NWSP6:%.*]] = call i64 @strtoll(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 6), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS3:%.*]] = getelementptr i64, i64* [[PS]], i64 3
 ; CHECK-NEXT:    store i64 [[NWSP6]], i64* [[PS3]], align 4
 ; CHECK-NEXT:    ret void
 ;
 ; Do not fold the result of conversion that's less than INT64_MIN.
   %psminm1 = getelementptr [22 x i8], [22 x i8]* @i64min_m1, i32 0, i32 0
-  %minm1 = call i64 @strtoll(i8* %psminm1, i8** null, i32 10)
+  %minm1 = call i64 @strtoll(i8* %psminm1, i8** @endptr, i32 10)
   %ps0 = getelementptr i64, i64* %ps, i32 0
   store i64 %minm1, i64* %ps0
 
 ; Do not fold the result of conversion that's greater than INT64_MAX.
   %psmaxp1 = getelementptr [21 x i8], [21 x i8]* @i64max_p1, i32 0, i32 0
-  %maxp1 = call i64 @strtoll(i8* %psmaxp1, i8** null, i32 10)
+  %maxp1 = call i64 @strtoll(i8* %psmaxp1, i8** @endptr, i32 10)
   %ps1 = getelementptr i64, i64* %ps, i32 1
   store i64 %maxp1, i64* %ps1
 
 ; Do not fold a sequence consisting of just whitespace characters.
   %psws = getelementptr [7 x i8], [7 x i8]* @ws, i32 0, i32 0
-  %nws = call i64 @strtoll(i8* %psws, i8** null, i32 10)
+  %nws = call i64 @strtoll(i8* %psws, i8** @endptr, i32 10)
   %ps2 = getelementptr i64, i64* %ps, i32 2
   store i64 %nws, i64* %ps2
 
 ; Do not fold an empty sequence.
   %pswsp6 = getelementptr [7 x i8], [7 x i8]* @ws, i32 0, i32 6
-  %nwsp6 = call i64 @strtoll(i8* %pswsp6, i8** null, i32 10)
+  %nwsp6 = call i64 @strtoll(i8* %pswsp6, i8** @endptr, i32 10)
   %ps3 = getelementptr i64, i64* %ps, i32 3
   store i64 %nwsp6, i64* %ps3
 
@@ -391,29 +406,29 @@
 
 define void @call_strtol_trailing_space(i32* %ps) {
 ; CHECK-LABEL: @call_strtol_trailing_space(
-; CHECK-NEXT:    [[N1:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([9 x i8], [9 x i8]* @i_1_2_3_, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[N1:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @i_1_2_3_, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS1:%.*]] = getelementptr i32, i32* [[PS:%.*]], i64 1
 ; CHECK-NEXT:    store i32 [[N1]], i32* [[PS1]], align 4
-; CHECK-NEXT:    [[N2:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([9 x i8], [9 x i8]* @i_1_2_3_, i64 0, i64 2), i8** null, i32 10)
+; CHECK-NEXT:    [[N2:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @i_1_2_3_, i64 0, i64 2), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS2:%.*]] = getelementptr i32, i32* [[PS]], i64 2
 ; CHECK-NEXT:    store i32 [[N2]], i32* [[PS2]], align 4
-; CHECK-NEXT:    [[N3:%.*]] = call i32 @strtol(i8* nocapture getelementptr inbounds ([9 x i8], [9 x i8]* @i_1_2_3_, i64 0, i64 4), i8** null, i32 10)
+; CHECK-NEXT:    [[N3:%.*]] = call i32 @strtol(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @i_1_2_3_, i64 0, i64 4), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS3:%.*]] = getelementptr i32, i32* [[PS]], i64 3
 ; CHECK-NEXT:    store i32 [[N3]], i32* [[PS3]], align 4
 ; CHECK-NEXT:    ret void
 ;
   %p1 = getelementptr [9 x i8], [9 x i8]* @i_1_2_3_, i32 0, i32 0
-  %n1 = call i32 @strtol(i8* %p1, i8** null, i32 10)
+  %n1 = call i32 @strtol(i8* %p1, i8** @endptr, i32 10)
   %ps1 = getelementptr i32, i32* %ps, i32 1
   store i32 %n1, i32* %ps1
 
   %p2 = getelementptr [9 x i8], [9 x i8]* @i_1_2_3_, i32 0, i32 2
-  %n2 = call i32 @strtol(i8* %p2, i8** null, i32 10)
+  %n2 = call i32 @strtol(i8* %p2, i8** @endptr, i32 10)
   %ps2 = getelementptr i32, i32* %ps, i32 2
   store i32 %n2, i32* %ps2
 
   %p3 = getelementptr [9 x i8], [9 x i8]* @i_1_2_3_, i32 0, i32 4
-  %n3 = call i32 @strtol(i8* %p3, i8** null, i32 10)
+  %n3 = call i32 @strtol(i8* %p3, i8** @endptr, i32 10)
   %ps3 = getelementptr i32, i32* %ps, i32 3
   store i32 %n3, i32* %ps3
 
diff --git a/llvm/test/Transforms/InstCombine/str-int-5.ll b/llvm/test/Transforms/InstCombine/str-int-5.ll
--- a/llvm/test/Transforms/InstCombine/str-int-5.ll
+++ b/llvm/test/Transforms/InstCombine/str-int-5.ll
@@ -39,32 +39,46 @@
 @x64max = constant [20 x i8] c" 0xffffffffffffffff\00"
 @ui64max_p1 = constant [22 x i8] c" 18446744073709551616\00"
 
+@endptr = external global i8*
+
 
 ; Exercise folding calls to 32-bit strtoul.
 
 define void @fold_strtoul(i32* %ps) {
 ; CHECK-LABEL: @fold_strtoul(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @ws_im123, i64 0, i64 10), i8** @endptr, align 8
 ; CHECK-NEXT:    store i32 -123, i32* [[PS:%.*]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @ws_ip234, i64 0, i64 10), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS1:%.*]] = getelementptr i32, i32* [[PS]], i64 1
 ; CHECK-NEXT:    store i32 234, i32* [[PS1]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @i32min_m1, i64 0, i64 12), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS2:%.*]] = getelementptr i32, i32* [[PS]], i64 2
 ; CHECK-NEXT:    store i32 2147483647, i32* [[PS2]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @i32min, i64 0, i64 12), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS3:%.*]] = getelementptr i32, i32* [[PS]], i64 3
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS3]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @o32min, i64 0, i64 14), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS4:%.*]] = getelementptr i32, i32* [[PS]], i64 4
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS4]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @mo32min, i64 0, i64 14), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS5:%.*]] = getelementptr i32, i32* [[PS]], i64 5
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS5]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @x32min, i64 0, i64 12), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS6:%.*]] = getelementptr i32, i32* [[PS]], i64 6
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS6]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @mx32min, i64 0, i64 12), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS7:%.*]] = getelementptr i32, i32* [[PS]], i64 7
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS7]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @i32max, i64 0, i64 11), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS8:%.*]] = getelementptr i32, i32* [[PS]], i64 8
 ; CHECK-NEXT:    store i32 2147483647, i32* [[PS8]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @mX01, i64 0, i64 5), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS9:%.*]] = getelementptr i32, i32* [[PS]], i64 9
 ; CHECK-NEXT:    store i32 -1, i32* [[PS9]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @i32max_p1, i64 0, i64 11), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS10:%.*]] = getelementptr i32, i32* [[PS]], i64 10
 ; CHECK-NEXT:    store i32 -2147483648, i32* [[PS10]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @ui32max, i64 0, i64 11), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS11:%.*]] = getelementptr i32, i32* [[PS]], i64 11
 ; CHECK-NEXT:    store i32 -1, i32* [[PS11]], align 4
 ; CHECK-NEXT:    ret void
@@ -72,73 +86,73 @@
 ; Fold a valid sequence with leading POSIX whitespace and a minus to
 ; (uint32_t)-123.
   %pwsm123 = getelementptr [11 x i8], [11 x i8]* @ws_im123, i32 0, i32 0
-  %im123 = call i32 @strtoul(i8* %pwsm123, i8** null, i32 10)
+  %im123 = call i32 @strtoul(i8* %pwsm123, i8** @endptr, i32 10)
   %ps0 = getelementptr i32, i32* %ps, i32 0
   store i32 %im123, i32* %ps0
 
 ; Fold a valid sequence with leading POSIX whitespace and a plus to +234.
   %pwsp234 = getelementptr [11 x i8], [11 x i8]* @ws_ip234, i32 0, i32 0
-  %ip234 = call i32 @strtoul(i8* %pwsp234, i8** null, i32 10)
+  %ip234 = call i32 @strtoul(i8* %pwsp234, i8** @endptr, i32 10)
   %ps1 = getelementptr i32, i32* %ps, i32 1
   store i32 %ip234, i32* %ps1
 
 ; Fold the result of conversion that's equal to INT32_MIN - 1.
   %psi32minm1 = getelementptr [13 x i8], [13 x i8]* @i32min_m1, i32 0, i32 0
-  %i32min32m1 = call i32 @strtoul(i8* %psi32minm1, i8** null, i32 10)
+  %i32min32m1 = call i32 @strtoul(i8* %psi32minm1, i8** @endptr, i32 10)
   %ps2 = getelementptr i32, i32* %ps, i32 2
   store i32 %i32min32m1, i32* %ps2
 
 ; Fold INT32_MIN.
   %psi32min = getelementptr [13 x i8], [13 x i8]* @i32min, i32 0, i32 0
-  %i32min = call i32 @strtoul(i8* %psi32min, i8** null, i32 10)
+  %i32min = call i32 @strtoul(i8* %psi32min, i8** @endptr, i32 10)
   %ps3 = getelementptr i32, i32* %ps, i32 3
   store i32 %i32min, i32* %ps3
 
 ; Fold INT32_MIN in octal.
   %pso32min = getelementptr [15 x i8], [15 x i8]* @o32min, i32 0, i32 0
-  %o32min = call i32 @strtoul(i8* %pso32min, i8** null, i32 0)
+  %o32min = call i32 @strtoul(i8* %pso32min, i8** @endptr, i32 0)
   %ps4 = getelementptr i32, i32* %ps, i32 4
   store i32 %o32min, i32* %ps4
 
 ; Fold -INT32_MIN in octal.
   %psmo32min = getelementptr [15 x i8], [15 x i8]* @mo32min, i32 0, i32 0
-  %mo32min = call i32 @strtoul(i8* %psmo32min, i8** null, i32 0)
+  %mo32min = call i32 @strtoul(i8* %psmo32min, i8** @endptr, i32 0)
   %ps5 = getelementptr i32, i32* %ps, i32 5
   store i32 %mo32min, i32* %ps5
 
 ; Fold INT32_MIN in hex.
   %psx32min = getelementptr [13 x i8], [13 x i8]* @x32min, i32 0, i32 0
-  %x32min = call i32 @strtoul(i8* %psx32min, i8** null, i32 0)
+  %x32min = call i32 @strtoul(i8* %psx32min, i8** @endptr, i32 0)
   %ps6 = getelementptr i32, i32* %ps, i32 6
   store i32 %x32min, i32* %ps6
 
 ; Fold -INT32_MIN in hex.
   %psmx32min = getelementptr [13 x i8], [13 x i8]* @mx32min, i32 0, i32 0
-  %mx32min = call i32 @strtoul(i8* %psmx32min, i8** null, i32 0)
+  %mx32min = call i32 @strtoul(i8* %psmx32min, i8** @endptr, i32 0)
   %ps7 = getelementptr i32, i32* %ps, i32 7
   store i32 %x32min, i32* %ps7
 
 ; Fold INT32_MAX.
   %psi32max = getelementptr [12 x i8], [12 x i8]* @i32max, i32 0, i32 0
-  %i32max = call i32 @strtoul(i8* %psi32max, i8** null, i32 10)
+  %i32max = call i32 @strtoul(i8* %psi32max, i8** @endptr, i32 10)
   %ps8 = getelementptr i32, i32* %ps, i32 8
   store i32 %i32max, i32* %ps8
 
 ; Fold -0x01.
   %psmX01 = getelementptr [6 x i8], [6 x i8]* @mX01, i32 0, i32 0
-  %mX01 = call i32 @strtoul(i8* %psmX01, i8** null, i32 0)
+  %mX01 = call i32 @strtoul(i8* %psmX01, i8** @endptr, i32 0)
   %ps9 = getelementptr i32, i32* %ps, i32 9
   store i32 %mX01, i32* %ps9
 
 ; Fold the result of conversion that's equal to INT32_MAX + 1.
   %psmax32p1 = getelementptr [12 x i8], [12 x i8]* @i32max_p1, i32 0, i32 0
-  %i32max32p1 = call i32 @strtoul(i8* %psmax32p1, i8** null, i32 10)
+  %i32max32p1 = call i32 @strtoul(i8* %psmax32p1, i8** @endptr, i32 10)
   %ps10 = getelementptr i32, i32* %ps, i32 10
   store i32 %i32max32p1, i32* %ps10
 
 ; Fold UINT32_MAX.
   %psmax = getelementptr [12 x i8], [12 x i8]* @ui32max, i32 0, i32 0
-  %ui32max = call i32 @strtoul(i8* %psmax, i8** null, i32 10)
+  %ui32max = call i32 @strtoul(i8* %psmax, i8** @endptr, i32 10)
   %ps11 = getelementptr i32, i32* %ps, i32 11
   store i32 %ui32max, i32* %ps11
 
@@ -150,15 +164,15 @@
 
 define void @call_strtoul(i32* %ps) {
 ; CHECK-LABEL: @call_strtoul(
-; CHECK-NEXT:    [[MINM1:%.*]] = call i32 @strtoul(i8* nocapture getelementptr inbounds ([22 x i8], [22 x i8]* @i64min_m1, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[MINM1:%.*]] = call i32 @strtoul(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @i64min_m1, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    store i32 [[MINM1]], i32* [[PS:%.*]], align 4
-; CHECK-NEXT:    [[MAXP1:%.*]] = call i32 @strtoul(i8* nocapture getelementptr inbounds ([12 x i8], [12 x i8]* @ui32max_p1, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[MAXP1:%.*]] = call i32 @strtoul(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @ui32max_p1, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS1:%.*]] = getelementptr i32, i32* [[PS]], i64 1
 ; CHECK-NEXT:    store i32 [[MAXP1]], i32* [[PS1]], align 4
-; CHECK-NEXT:    [[NWS:%.*]] = call i32 @strtoul(i8* nocapture getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[NWS:%.*]] = call i32 @strtoul(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS2:%.*]] = getelementptr i32, i32* [[PS]], i64 2
 ; CHECK-NEXT:    store i32 [[NWS]], i32* [[PS2]], align 4
-; CHECK-NEXT:    [[NWSP6:%.*]] = call i32 @strtoul(i8* nocapture getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 6), i8** null, i32 10)
+; CHECK-NEXT:    [[NWSP6:%.*]] = call i32 @strtoul(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 6), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS3:%.*]] = getelementptr i32, i32* [[PS]], i64 3
 ; CHECK-NEXT:    store i32 [[NWSP6]], i32* [[PS3]], align 4
 ; CHECK-NEXT:    ret void
@@ -166,27 +180,27 @@
 ; Do not fold the result of conversion that overflows uint32_t.  This
 ; could be folded into a constant provided errnor were set to ERANGE.
   %psminm1 = getelementptr [22 x i8], [22 x i8]* @i64min_m1, i32 0, i32 0
-  %minm1 = call i32 @strtoul(i8* %psminm1, i8** null, i32 10)
+  %minm1 = call i32 @strtoul(i8* %psminm1, i8** @endptr, i32 10)
   %ps0 = getelementptr i32, i32* %ps, i32 0
   store i32 %minm1, i32* %ps0
 
 ; Do not fold the result of conversion that's greater than UINT32_MAX
 ; (same logic as above applies here).
   %psui32maxp1 = getelementptr [12 x i8], [12 x i8]* @ui32max_p1, i32 0, i32 0
-  %maxp1 = call i32 @strtoul(i8* %psui32maxp1, i8** null, i32 10)
+  %maxp1 = call i32 @strtoul(i8* %psui32maxp1, i8** @endptr, i32 10)
   %ps1 = getelementptr i32, i32* %ps, i32 1
   store i32 %maxp1, i32* %ps1
 
 ; Do not fold a sequence consisting of just whitespace characters.
   %psws = getelementptr [7 x i8], [7 x i8]* @ws, i32 0, i32 0
-  %nws = call i32 @strtoul(i8* %psws, i8** null, i32 10)
+  %nws = call i32 @strtoul(i8* %psws, i8** @endptr, i32 10)
   %ps2 = getelementptr i32, i32* %ps, i32 2
   store i32 %nws, i32* %ps2
 
 ; Do not fold an empty sequence.  The library call may or may not end up
 ; storing EINVAL in errno.
   %pswsp6 = getelementptr [7 x i8], [7 x i8]* @ws, i32 0, i32 6
-  %nwsp6 = call i32 @strtoul(i8* %pswsp6, i8** null, i32 10)
+  %nwsp6 = call i32 @strtoul(i8* %pswsp6, i8** @endptr, i32 10)
   %ps3 = getelementptr i32, i32* %ps, i32 3
   store i32 %nwsp6, i32* %ps3
 
@@ -198,25 +212,36 @@
 
 define void @fold_strtoull(i64* %ps) {
 ; CHECK-LABEL: @fold_strtoull(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @ws_im123, i64 0, i64 10), i8** @endptr, align 8
 ; CHECK-NEXT:    store i64 -123, i64* [[PS:%.*]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @ws_ip234, i64 0, i64 10), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS1:%.*]] = getelementptr i64, i64* [[PS]], i64 1
 ; CHECK-NEXT:    store i64 234, i64* [[PS1]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([22 x i8], [22 x i8]* @i64min_m1, i64 0, i64 21), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS2:%.*]] = getelementptr i64, i64* [[PS]], i64 2
 ; CHECK-NEXT:    store i64 9223372036854775807, i64* [[PS2]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @i32min, i64 0, i64 12), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS3:%.*]] = getelementptr i64, i64* [[PS]], i64 3
 ; CHECK-NEXT:    store i64 -2147483648, i64* [[PS3]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @o32min, i64 0, i64 14), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS4:%.*]] = getelementptr i64, i64* [[PS]], i64 4
 ; CHECK-NEXT:    store i64 2147483648, i64* [[PS4]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @x32min, i64 0, i64 12), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS5:%.*]] = getelementptr i64, i64* [[PS]], i64 5
 ; CHECK-NEXT:    store i64 2147483648, i64* [[PS5]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([22 x i8], [22 x i8]* @i64min, i64 0, i64 21), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS6:%.*]] = getelementptr i64, i64* [[PS]], i64 6
 ; CHECK-NEXT:    store i64 -9223372036854775808, i64* [[PS6]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([21 x i8], [21 x i8]* @i64max, i64 0, i64 20), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS7:%.*]] = getelementptr i64, i64* [[PS]], i64 7
 ; CHECK-NEXT:    store i64 9223372036854775807, i64* [[PS7]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([21 x i8], [21 x i8]* @i64max_p1, i64 0, i64 20), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS8:%.*]] = getelementptr i64, i64* [[PS]], i64 8
 ; CHECK-NEXT:    store i64 -9223372036854775808, i64* [[PS8]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([22 x i8], [22 x i8]* @ui64max, i64 0, i64 21), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS9:%.*]] = getelementptr i64, i64* [[PS]], i64 9
 ; CHECK-NEXT:    store i64 -1, i64* [[PS9]], align 4
+; CHECK-NEXT:    store i8* getelementptr inbounds ([20 x i8], [20 x i8]* @x64max, i64 0, i64 19), i8** @endptr, align 8
 ; CHECK-NEXT:    [[PS10:%.*]] = getelementptr i64, i64* [[PS]], i64 10
 ; CHECK-NEXT:    store i64 -1, i64* [[PS10]], align 4
 ; CHECK-NEXT:    ret void
@@ -224,67 +249,67 @@
 ; Fold a valid sequence with leading POSIX whitespace and a minus to
 ; (uint64_t)-123.
   %pwsm123 = getelementptr [11 x i8], [11 x i8]* @ws_im123, i32 0, i32 0
-  %im123 = call i64 @strtoull(i8* %pwsm123, i8** null, i32 10)
+  %im123 = call i64 @strtoull(i8* %pwsm123, i8** @endptr, i32 10)
   %ps0 = getelementptr i64, i64* %ps, i32 0
   store i64 %im123, i64* %ps0
 
 ; Fold a valid sequence with leading POSIX whitespace and a plus to +234.
   %pwsp234 = getelementptr [11 x i8], [11 x i8]* @ws_ip234, i32 0, i32 0
-  %ip234 = call i64 @strtoull(i8* %pwsp234, i8** null, i32 10)
+  %ip234 = call i64 @strtoull(i8* %pwsp234, i8** @endptr, i32 10)
   %ps1 = getelementptr i64, i64* %ps, i32 1
   store i64 %ip234, i64* %ps1
 
 ; Fold the result of conversion that's equal to INT64_MIN - 1.
   %psi64minm1 = getelementptr [22 x i8], [22 x i8]* @i64min_m1, i32 0, i32 0
-  %i64min32m1 = call i64 @strtoull(i8* %psi64minm1, i8** null, i32 10)
+  %i64min32m1 = call i64 @strtoull(i8* %psi64minm1, i8** @endptr, i32 10)
   %ps2 = getelementptr i64, i64* %ps, i32 2
   store i64 %i64min32m1, i64* %ps2
 
 ; Fold INT32_MIN.
   %psi32min = getelementptr [13 x i8], [13 x i8]* @i32min, i32 0, i32 0
-  %i32min = call i64 @strtoull(i8* %psi32min, i8** null, i32 10)
+  %i32min = call i64 @strtoull(i8* %psi32min, i8** @endptr, i32 10)
   %ps3 = getelementptr i64, i64* %ps, i32 3
   store i64 %i32min, i64* %ps3
 
 ; Fold INT32_MIN in octal.
   %pso32min = getelementptr [15 x i8], [15 x i8]* @o32min, i32 0, i32 0
-  %o32min = call i64 @strtoull(i8* %pso32min, i8** null, i32 0)
+  %o32min = call i64 @strtoull(i8* %pso32min, i8** @endptr, i32 0)
   %ps4 = getelementptr i64, i64* %ps, i32 4
   store i64 %o32min, i64* %ps4
 
 ; Fold INT32_MIN in hex.
   %psx32min = getelementptr [13 x i8], [13 x i8]* @x32min, i32 0, i32 0
-  %x32min = call i64 @strtoull(i8* %psx32min, i8** null, i32 0)
+  %x32min = call i64 @strtoull(i8* %psx32min, i8** @endptr, i32 0)
   %ps5 = getelementptr i64, i64* %ps, i32 5
   store i64 %x32min, i64* %ps5
 
 ; Fold INT64_MIN.
   %psi64min = getelementptr [22 x i8], [22 x i8]* @i64min, i32 0, i32 0
-  %i64min = call i64 @strtoull(i8* %psi64min, i8** null, i32 10)
+  %i64min = call i64 @strtoull(i8* %psi64min, i8** @endptr, i32 10)
   %ps6 = getelementptr i64, i64* %ps, i32 6
   store i64 %i64min, i64* %ps6
 
 ; Fold INT64_MAX.
   %psi64max = getelementptr [21 x i8], [21 x i8]* @i64max, i32 0, i32 0
-  %i64max = call i64 @strtoull(i8* %psi64max, i8** null, i32 10)
+  %i64max = call i64 @strtoull(i8* %psi64max, i8** @endptr, i32 10)
   %ps7 = getelementptr i64, i64* %ps, i32 7
   store i64 %i64max, i64* %ps7
 
 ; Fold the result of conversion that's equal to INT64_MAX + 1 to INT64_MIN.
   %psmax32p1 = getelementptr [21 x i8], [21 x i8]* @i64max_p1, i32 0, i32 0
-  %i64max32p1 = call i64 @strtoull(i8* %psmax32p1, i8** null, i32 10)
+  %i64max32p1 = call i64 @strtoull(i8* %psmax32p1, i8** @endptr, i32 10)
   %ps8 = getelementptr i64, i64* %ps, i32 8
   store i64 %i64max32p1, i64* %ps8
 
 ; Fold UINT64_MAX.
   %psmax = getelementptr [22 x i8], [22 x i8]* @ui64max, i32 0, i32 0
-  %ui64max = call i64 @strtoull(i8* %psmax, i8** null, i32 10)
+  %ui64max = call i64 @strtoull(i8* %psmax, i8** @endptr, i32 10)
   %ps9 = getelementptr i64, i64* %ps, i32 9
   store i64 %ui64max, i64* %ps9
 
 ; Fold UINT64_MAX in hex.
   %psxmax = getelementptr [20 x i8], [20 x i8]* @x64max, i32 0, i32 0
-  %x64max = call i64 @strtoull(i8* %psxmax, i8** null, i32 0)
+  %x64max = call i64 @strtoull(i8* %psxmax, i8** @endptr, i32 0)
   %ps10 = getelementptr i64, i64* %ps, i32 10
   store i64 %x64max, i64* %ps10
 
@@ -296,13 +321,13 @@
 
 define void @call_strtoull(i64* %ps) {
 ; CHECK-LABEL: @call_strtoull(
-; CHECK-NEXT:    [[MAXP1:%.*]] = call i64 @strtoull(i8* nocapture getelementptr inbounds ([22 x i8], [22 x i8]* @ui64max_p1, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[MAXP1:%.*]] = call i64 @strtoull(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @ui64max_p1, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS1:%.*]] = getelementptr i64, i64* [[PS:%.*]], i64 1
 ; CHECK-NEXT:    store i64 [[MAXP1]], i64* [[PS1]], align 4
-; CHECK-NEXT:    [[NWS:%.*]] = call i64 @strtoull(i8* nocapture getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 0), i8** null, i32 10)
+; CHECK-NEXT:    [[NWS:%.*]] = call i64 @strtoull(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 0), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS2:%.*]] = getelementptr i64, i64* [[PS]], i64 2
 ; CHECK-NEXT:    store i64 [[NWS]], i64* [[PS2]], align 4
-; CHECK-NEXT:    [[NWSP6:%.*]] = call i64 @strtoull(i8* nocapture getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 6), i8** null, i32 10)
+; CHECK-NEXT:    [[NWSP6:%.*]] = call i64 @strtoull(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @ws, i64 0, i64 6), i8** nonnull @endptr, i32 10)
 ; CHECK-NEXT:    [[PS3:%.*]] = getelementptr i64, i64* [[PS]], i64 3
 ; CHECK-NEXT:    store i64 [[NWSP6]], i64* [[PS3]], align 4
 ; CHECK-NEXT:    ret void
@@ -310,20 +335,20 @@
 ; Do not fold the result of conversion that overflows uint64_t.  This
 ; could be folded into a constant provided errnor were set to ERANGE.
   %psui64maxp1 = getelementptr [22 x i8], [22 x i8]* @ui64max_p1, i32 0, i32 0
-  %maxp1 = call i64 @strtoull(i8* %psui64maxp1, i8** null, i32 10)
+  %maxp1 = call i64 @strtoull(i8* %psui64maxp1, i8** @endptr, i32 10)
   %ps1 = getelementptr i64, i64* %ps, i32 1
   store i64 %maxp1, i64* %ps1
 
 ; Do not fold a sequence consisting of just whitespace characters.
   %psws = getelementptr [7 x i8], [7 x i8]* @ws, i32 0, i32 0
-  %nws = call i64 @strtoull(i8* %psws, i8** null, i32 10)
+  %nws = call i64 @strtoull(i8* %psws, i8** @endptr, i32 10)
   %ps2 = getelementptr i64, i64* %ps, i32 2
   store i64 %nws, i64* %ps2
 
 ; Do not fold an empty sequence.  The library call may or may not end up
 ; storing EINVAL in errno.
   %pswsp6 = getelementptr [7 x i8], [7 x i8]* @ws, i32 0, i32 6
-  %nwsp6 = call i64 @strtoull(i8* %pswsp6, i8** null, i32 10)
+  %nwsp6 = call i64 @strtoull(i8* %pswsp6, i8** @endptr, i32 10)
   %ps3 = getelementptr i64, i64* %ps, i32 3
   store i64 %nwsp6, i64* %ps3