[llvm] [GlobalISel] Remove AssumptionCacheTracker from O0 pipeline (PR #195031)

[via llvm-commits]

llvmorg-github-actions[bot] wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-globalisel

Author: Cullen Rhodes (c-rhodes)

<details>
<summary>Changes</summary>

This is for an optimizer hint that shouldn't be necessary at O0. Small -0.09% compile time improvement on aarch64-O0-g.

https://llvm-compile-time-tracker.com/compare.php?from=4e6d3722fca73c97367720180a8d547057fda380&to=95b13462d4ff97f3fe5542e3eede0ad029a635f3&stat=instructions%3Au

---
Full diff: https://github.com/llvm/llvm-project/pull/195031.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp (+4-4) 


``````````diff
diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index 0ea59a38db40f..ae44aa81636d6 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -174,8 +174,8 @@ void IRTranslator::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addRequired<StackProtector>();
   AU.addRequired<TargetPassConfig>();
   AU.addRequired<GISelCSEAnalysisWrapperPass>();
-  AU.addRequired<AssumptionCacheTracker>();
   if (OptLevel != CodeGenOptLevel::None) {
+    AU.addRequired<AssumptionCacheTracker>();
     AU.addRequired<BranchProbabilityInfoWrapperPass>();
     AU.addRequired<AAResultsWrapperPass>();
   }
@@ -4221,13 +4221,13 @@ bool IRTranslator::runOnMachineFunction(MachineFunction &CurMF) {
   if (EnableOpts) {
     AA = &getAnalysis<AAResultsWrapperPass>().getAAResults();
     FuncInfo.BPI = &getAnalysis<BranchProbabilityInfoWrapperPass>().getBPI();
+    AC = &getAnalysis<AssumptionCacheTracker>().getAssumptionCache(
+        MF->getFunction());
   } else {
     AA = nullptr;
     FuncInfo.BPI = nullptr;
+    AC = nullptr;
   }
-
-  AC = &getAnalysis<AssumptionCacheTracker>().getAssumptionCache(
-      MF->getFunction());
   LibInfo = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(F);
   Libcalls = &getAnalysis<LibcallLoweringInfoWrapper>().getLibcallLowering(
       *F.getParent(), Subtarget);

``````````

</details>


https://github.com/llvm/llvm-project/pull/195031