[llvm] 2d67a86 - [SCEVExpander] Use IntToPtr for temporary instruction.

[Florian Hahn via llvm-commits]

Author: Florian Hahn
Date: 2022-01-11T09:40:21Z
New Revision: 2d67a86b7c14a4f3686e50608a80adb5e7b5cb92

URL: https://github.com/llvm/llvm-project/commit/2d67a86b7c14a4f3686e50608a80adb5e7b5cb92
DIFF: https://github.com/llvm/llvm-project/commit/2d67a86b7c14a4f3686e50608a80adb5e7b5cb92.diff

LOG: [SCEVExpander] Use IntToPtr for temporary instruction.

Use PtrToInt instead Add when creating temporary instructions. The add
might get folded away with more sophisticated folding.

Added: 
    

Modified: 
    llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp b/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
index b41b63432c3dd..fe8215d3b9916 100644
--- a/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
+++ b/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
@@ -1843,8 +1843,8 @@ Value *SCEVExpander::expandCodeForImpl(const SCEV *SH, Type *Ty, bool Root) {
       // instruction.
       Instruction *Tmp;
       if (Inst->getType()->isIntegerTy())
-        Tmp =
-            cast<Instruction>(Builder.CreateAdd(Inst, Inst, "tmp.lcssa.user"));
+        Tmp = cast<Instruction>(Builder.CreateIntToPtr(
+            Inst, Inst->getType()->getPointerTo(), "tmp.lcssa.user"));
       else {
         assert(Inst->getType()->isPointerTy());
         Tmp = cast<Instruction>(Builder.CreatePtrToInt(