Index: lib/CodeGen/AsmPrinter/AsmPrinter.cpp
===================================================================
--- lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -2975,27 +2975,16 @@
     return lowerConstant(Op);
   }
 
-  case Instruction::PtrToInt: {
-    const DataLayout &DL = getDataLayout();
-
+  case Instruction::PtrToInt:
     // Support only foldable casts to/from pointers that can be eliminated by
     // changing the pointer to the appropriately sized integer type.
-    Constant *Op = CE->getOperand(0);
-    Type *Ty = CE->getType();
-
-    const MCExpr *OpExpr = lowerConstant(Op);
-
+    //
     // We can emit the pointer value into this slot if the slot is an
-    // integer slot equal to the size of the pointer.
+    // integer slot.
     //
-    // If the pointer is larger than the resultant integer, then
-    // as with Trunc just depend on the assembler to truncate it.
-    if (DL.getTypeAllocSize(Ty).getFixedValue() <=
-        DL.getTypeAllocSize(Op->getType()).getFixedValue())
-      return OpExpr;
-
-    break; // Error
-  }
+    // If the pointer is larger or smaller than the resultant integer, then
+    // just depend on the assembler to truncate or extend it.
+    return lowerConstant(CE->getOperand(0));
 
   case Instruction::Sub: {
     GlobalValue *LHSGV;
Index: test/CodeGen/WebAssembly/ptrtoint-widen.ll
===================================================================
--- /dev/null
+++ test/CodeGen/WebAssembly/ptrtoint-widen.ll
@@ -0,0 +1,6 @@
+; RUN: llc < %s -mtriple=wasm32-unknown-unknown | FileCheck %s
+
+@ptr = external global i8, align 1
+@ref = constant i64 ptrtoint (ptr @ptr to i64), align 8
+
+; CHECK: .int64  ptr{{$}}
Index: test/CodeGen/X86/ptrtoint-widen.ll
===================================================================
--- /dev/null
+++ test/CodeGen/X86/ptrtoint-widen.ll
@@ -0,0 +1,6 @@
+; RUN: llc < %s -mtriple=i686-unknown-linux-gnu | FileCheck %s
+
+@ptr = external global i8, align 1
+@ref = constant i64 ptrtoint (ptr @ptr to i64), align 8
+
+; CHECK: .quad  ptr{{$}}