[llvm] SimplifyLibCalls: Use the correct address space when computing integer widths. (PR #118586)

[Eli Friedman via llvm-commits]

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@@ -590,26 +588,35 @@ Value *LibCallSimplifier::optimizeStrCmp(CallInst *CI, IRBuilderBase &B) {
   if (Len1 && Len2) {
     return copyFlags(
         *CI, emitMemCmp(Str1P, Str2P,
-                        ConstantInt::get(DL.getIntPtrType(CI->getContext()),
-                                         std::min(Len1, Len2)),
+                        ConstantInt::get(
+                            DL.getIntPtrType(
+                                CI->getContext(),
+                                Str1P->getType()->getPointerAddressSpace()),
+                            std::min(Len1, Len2)),
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efriedma-quic wrote:

getSizeTSize() is supposed to be the bitwidth of the type size_t.  There's only one size_t.  This is useful because we're talking about C library functions, which are defined in terms of size_t.

If you want to query information about a specific address-space, we have appropriate datalayout APIs.

https://github.com/llvm/llvm-project/pull/118586