diff --git a/llvm/lib/Transforms/Scalar/SCCP.cpp b/llvm/lib/Transforms/Scalar/SCCP.cpp
--- a/llvm/lib/Transforms/Scalar/SCCP.cpp
+++ b/llvm/lib/Transforms/Scalar/SCCP.cpp
@@ -872,16 +872,10 @@
   LatticeVal TVal = getValueState(I.getTrueValue());
   LatticeVal FVal = getValueState(I.getFalseValue());
 
-  // select ?, C, C -> C.
-  if (isConstant(TVal) && isConstant(FVal) &&
-      getConstant(TVal) == getConstant(FVal))
-    return (void)markConstant(&I, getConstant(FVal));
-
-  if (TVal.isUnknown())   // select ?, undef, X -> X.
-    return (void)mergeInValue(&I, FVal);
-  if (FVal.isUnknown())   // select ?, X, undef -> X.
-    return (void)mergeInValue(&I, TVal);
-  markOverdefined(&I);
+  bool Changed = ValueState[&I].mergeIn(TVal, DL);
+  Changed |= ValueState[&I].mergeIn(FVal, DL);
+  if (Changed)
+    pushToWorkListMsg(ValueState[&I], &I);
 }
 
 // Handle Unary Operators.
diff --git a/llvm/test/Transforms/SCCP/ip-ranges-select.ll b/llvm/test/Transforms/SCCP/ip-ranges-select.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/SCCP/ip-ranges-select.ll
@@ -0,0 +1,73 @@
+; RUN: opt < %s -ipsccp -S | FileCheck %s
+
+define internal i1 @f1(i32 %x, i32 %y, i1 %cmp) {
+; CHECK-LABEL: define internal i1 @f1(i32 %x, i32 %y, i1 %cmp) {
+; CHECK-NEXT:    %sel.1 = select i1 %cmp, i32 %x, i32 %y
+; CHECK-NEXT:    %c.2 = icmp sgt i32 %sel.1, 100
+; CHECK-NEXT:    %c.3 = icmp eq i32 %sel.1, 50
+; CHECK-NEXT:    %res.1 = add i1 false, %c.2
+; CHECK-NEXT:    %res.2 = add i1 %res.1, %c.3
+; CHECK-NEXT:    %res.3 = add i1 %res.2, false
+; CHECK-NEXT:    ret i1 %res.3
+;
+  %sel.1 = select i1 %cmp, i32 %x, i32 %y
+  %c.1 = icmp sgt i32 %sel.1, 300
+  %c.2 = icmp sgt i32 %sel.1, 100
+  %c.3 = icmp eq i32 %sel.1, 50
+  %c.4 = icmp slt i32 %sel.1, 9
+  %res.1 = add i1 %c.1, %c.2
+  %res.2 = add i1 %res.1, %c.3
+  %res.3 = add i1 %res.2, %c.4
+  ret i1 %res.3
+}
+
+define i1 @caller1(i1 %cmp) {
+; CHECK-LABEL:  define i1 @caller1(i1 %cmp) {
+; CHECK-NEXT:    %call.1 = tail call i1 @f1(i32 10, i32 100, i1 %cmp)
+; CHECK-NEXT:    %call.2 = tail call i1 @f1(i32 20, i32 200, i1 %cmp)
+; CHECK-NEXT:    %res = and i1 %call.1, %call.2
+; CHECK-NEXT:    ret i1 %res
+;
+  %call.1 = tail call i1 @f1(i32 10, i32 100, i1 %cmp)
+  %call.2 = tail call i1 @f1(i32 20, i32 200, i1 %cmp)
+  %res = and i1 %call.1, %call.2
+  ret i1 %res
+}
+
+
+define i1 @f2(i32 %x, i32 %y, i1 %cmp) {
+; CHECK-LABEL: define i1 @f2(i32 %x, i32 %y, i1 %cmp) {
+; CHECK-NEXT:    %sel.1 = select i1 %cmp, i32 %x, i32 %y
+; CHECK-NEXT:    %c.1 = icmp sgt i32 %sel.1, 300
+; CHECK-NEXT:    %c.2 = icmp sgt i32 %sel.1, 100
+; CHECK-NEXT:    %c.3 = icmp eq i32 %sel.1, 50
+; CHECK-NEXT:    %c.4 = icmp slt i32 %sel.1, 9
+; CHECK-NEXT:    %res.1 = add i1 %c.1, %c.2
+; CHECK-NEXT:    %res.2 = add i1 %res.1, %c.3
+; CHECK-NEXT:    %res.3 = add i1 %res.2, %c.4
+; CHECK-NEXT:    ret i1 %res.3
+;
+  %sel.1 = select i1 %cmp, i32 %x, i32 %y
+  %c.1 = icmp sgt i32 %sel.1, 300
+  %c.2 = icmp sgt i32 %sel.1, 100
+  %c.3 = icmp eq i32 %sel.1, 50
+  %c.4 = icmp slt i32 %sel.1, 9
+  %res.1 = add i1 %c.1, %c.2
+  %res.2 = add i1 %res.1, %c.3
+  %res.3 = add i1 %res.2, %c.4
+  ret i1 %res.3
+}
+
+define i1 @caller2(i32 %y, i1 %cmp) {
+; CHECK-LABEL:  define i1 @caller2(i32 %y, i1 %cmp) {
+; CHECK-NEXT:    %call.1 = tail call i1 @f2(i32 10, i32 %y, i1 %cmp)
+; CHECK-NEXT:    %call.2 = tail call i1 @f2(i32 20, i32 %y, i1 %cmp)
+; CHECK-NEXT:    %res = and i1 %call.1, %call.2
+; CHECK-NEXT:    ret i1 %res
+;
+  %call.1 = tail call i1 @f2(i32 10, i32 %y, i1 %cmp)
+  %call.2 = tail call i1 @f2(i32 20, i32 %y, i1 %cmp)
+  %res = and i1 %call.1, %call.2
+  ret i1 %res
+}
+
diff --git a/llvm/test/Transforms/SCCP/select.ll b/llvm/test/Transforms/SCCP/select.ll
--- a/llvm/test/Transforms/SCCP/select.ll
+++ b/llvm/test/Transforms/SCCP/select.ll
@@ -1,12 +1,40 @@
-; RUN: opt < %s -sccp -S | not grep select
+; RUN: opt < %s -sccp -S | FileCheck %s
 
 define i32 @test1(i1 %C) {
+; CHECK-LABEL: define i32 @test1(
+; CHECK-NEXT:   ret i32 0
+;
 	%X = select i1 %C, i32 0, i32 0		; <i32> [#uses=1]
 	ret i32 %X
 }
 
 define i32 @test2(i1 %C) {
+; CHECK-LABEL: define i32 @test2(
+; CHECK-NEXT:   ret i32 0
+;
 	%X = select i1 %C, i32 0, i32 undef		; <i32> [#uses=1]
 	ret i32 %X
 }
 
+define i1 @f2(i32 %x, i1 %cmp) {
+; CHECK-LABEL: define i1 @f2(i32 %x, i1 %cmp) {
+; CHECK-NEXT:    %sel.1 = select i1 %cmp, i32 %x, i32 10
+; CHECK-NEXT:    %c.1 = icmp sgt i32 %sel.1, 300
+; CHECK-NEXT:    %c.2 = icmp sgt i32 %sel.1, 100
+; CHECK-NEXT:    %c.3 = icmp eq i32 %sel.1, 50
+; CHECK-NEXT:    %c.4 = icmp slt i32 %sel.1, 9
+; CHECK-NEXT:    %res.1 = add i1 %c.1, %c.2
+; CHECK-NEXT:    %res.2 = add i1 %res.1, %c.3
+; CHECK-NEXT:    %res.3 = add i1 %res.2, %c.4
+; CHECK-NEXT:    ret i1 %res.3
+;
+  %sel.1 = select i1 %cmp, i32 %x, i32 10
+  %c.1 = icmp sgt i32 %sel.1, 300
+  %c.2 = icmp sgt i32 %sel.1, 100
+  %c.3 = icmp eq i32 %sel.1, 50
+  %c.4 = icmp slt i32 %sel.1, 9
+  %res.1 = add i1 %c.1, %c.2
+  %res.2 = add i1 %res.1, %c.3
+  %res.3 = add i1 %res.2, %c.4
+  ret i1 %res.3
+}