[llvm] 4e89e71 - [CodeGenPrepare][NPM] Remove incorrect LoopAnalysis preservation in CodeGenPrepare (#172418)

[via llvm-commits]

Author: Teja Alaghari
Date: 2025-12-19T11:08:31+05:30
New Revision: 4e89e710d971791cca98c367d7ae5d5444953cbc

URL: https://github.com/llvm/llvm-project/commit/4e89e710d971791cca98c367d7ae5d5444953cbc
DIFF: https://github.com/llvm/llvm-project/commit/4e89e710d971791cca98c367d7ae5d5444953cbc.diff

LOG: [CodeGenPrepare][NPM] Remove incorrect LoopAnalysis preservation in CodeGenPrepare (#172418)

CodeGenPrepare modifies and restructures loops & control flow. So, it
shouldn't preserve LoopAnalysis.

The test `llvm/test/CodeGen/AMDGPU/cf-loop-on-constant.ll` shows
CodeGenPrepare modifying loop structure, hence we cannot preserve
LoopAnalysis.

Added: 
    

Modified: 
    llvm/lib/CodeGen/CodeGenPrepare.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 587c1372b19cb..01f49b8ecccff 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -556,7 +556,6 @@ PreservedAnalyses CodeGenPreparePass::run(Function &F,
   PreservedAnalyses PA;
   PA.preserve<TargetLibraryAnalysis>();
   PA.preserve<TargetIRAnalysis>();
-  PA.preserve<LoopAnalysis>();
   return PA;
 }