[llvm] [AMDGPULowerBufferFatPointers] Expand const exprs using fat pointers (PR #95558)

[Nikita Popov via llvm-commits]

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@@ -176,7 +179,7 @@ define i64 @ptrtoint_short() {
 define i32 @ptrtoint_very_short() {
 ; CHECK-LABEL: define i32 @ptrtoint_very_short
 ; CHECK-SAME: () #[[ATTR0]] {
-; CHECK-NEXT:    ret i32 add nuw nsw (i32 shl (i32 ptrtoint (ptr addrspace(8) @buf to i32), i32 32), i32 12)
+; CHECK-NEXT:    ret i32 12
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nikic wrote:

This is the same as https://github.com/llvm/llvm-project/pull/95543, but for constants. It previously produced a poison shift that shouldn't be there.

https://github.com/llvm/llvm-project/pull/95558