[llvm] 9129363 - [GlobalISel] Use more inline elements in a match table SmallVector (#202568)

[via llvm-commits]

Author: Cullen Rhodes
Date: 2026-06-09T13:05:12+01:00
New Revision: 9129363adbcc3474639e2a3b2b263905da1f86ca

URL: https://github.com/llvm/llvm-project/commit/9129363adbcc3474639e2a3b2b263905da1f86ca
DIFF: https://github.com/llvm/llvm-project/commit/9129363adbcc3474639e2a3b2b263905da1f86ca.diff

LOG: [GlobalISel] Use more inline elements in a match table SmallVector (#202568)

The 4 inline elements for OnFailResumeAt only cover 36.8% (33455 / 90902) of
aarch64-isel executeMatchTable invocations encountered while compiling sqlite3
on aarch64-O0-g.

The 8 inline elements cover 100% (maximum observed depth was 6). Small -0.09%
CTMark geomean improvement on aarch64-O0-g.

https://llvm-compile-time-tracker.com/compare.php?from=2de2edb943fe1b83d79bdffa03606eb8c5452e9b&to=8deb4f949b5f80a26a8a61775fb411bf30fefd80&stat=instructions%3Au

Assisted-by: codex

Added: 
    

Modified: 
    llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h

Removed: 
    


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diff  --git a/llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h b/llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h
index 70ee75108ffb8..e0720928c6526 100644
--- a/llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h
@@ -51,7 +51,7 @@ bool GIMatchTableExecutor::executeMatchTable(
     CodeGenCoverage *CoverageInfo) const {
 
   uint64_t CurrentIdx = 0;
-  SmallVector<uint64_t, 4> OnFailResumeAt;
+  SmallVector<uint64_t, 8> OnFailResumeAt;
   NewMIVector OutMIs;
 
   GISelChangeObserver *Observer = Builder.getObserver();