[llvm] 801b1dc - [GVN] Add support for ptrtoaddr

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2025-10-08T15:57:43+02:00
New Revision: 801b1dc9cc17ed8b135348add7f95efbd096981d

URL: https://github.com/llvm/llvm-project/commit/801b1dc9cc17ed8b135348add7f95efbd096981d
DIFF: https://github.com/llvm/llvm-project/commit/801b1dc9cc17ed8b135348add7f95efbd096981d.diff

LOG: [GVN] Add support for ptrtoaddr

Added: 
    

Modified: 
    llvm/lib/Transforms/Scalar/GVN.cpp
    llvm/test/Transforms/GVN/ptrtoaddr.ll

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp
index b9b5b5823d780..638952a3aa58f 100644
--- a/llvm/lib/Transforms/Scalar/GVN.cpp
+++ b/llvm/lib/Transforms/Scalar/GVN.cpp
@@ -699,6 +699,7 @@ uint32_t GVNPass::ValueTable::lookupOrAdd(Value *V) {
     case Instruction::FPTrunc:
     case Instruction::FPExt:
     case Instruction::PtrToInt:
+    case Instruction::PtrToAddr:
     case Instruction::IntToPtr:
     case Instruction::AddrSpaceCast:
     case Instruction::BitCast:

diff  --git a/llvm/test/Transforms/GVN/ptrtoaddr.ll b/llvm/test/Transforms/GVN/ptrtoaddr.ll
index 53240f85f6b5f..6d02bc67a820b 100644
--- a/llvm/test/Transforms/GVN/ptrtoaddr.ll
+++ b/llvm/test/Transforms/GVN/ptrtoaddr.ll
@@ -4,10 +4,8 @@
 define i64 @ptrtoaddr_same(ptr %p) {
 ; CHECK-LABEL: define i64 @ptrtoaddr_same(
 ; CHECK-SAME: ptr [[P:%.*]]) {
-; CHECK-NEXT:    [[I:%.*]] = ptrtoaddr ptr [[P]] to i64
 ; CHECK-NEXT:    [[J:%.*]] = ptrtoaddr ptr [[P]] to i64
-; CHECK-NEXT:    [[SUB:%.*]] = sub i64 [[I]], [[J]]
-; CHECK-NEXT:    ret i64 [[SUB]]
+; CHECK-NEXT:    ret i64 0
 ;
   %i = ptrtoaddr ptr %p to i64
   %j = ptrtoaddr ptr %p to i64