[PATCH] D112196: [PowerPC] return early if there is no preparing candidate in the loop; NFC
ChenZheng via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Oct 21 23:10:32 PDT 2021
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG13755436bb3d: [PowerPC] return early if there is no preparing candidate in the loop; NFC (authored by shchenz).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D112196/new/
https://reviews.llvm.org/D112196
Files:
llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
Index: llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
===================================================================
--- llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
+++ llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
@@ -174,6 +174,7 @@
LoopInfo *LI;
ScalarEvolution *SE;
bool PreserveLCSSA;
+ bool HasCandidateForPrepare;
/// Successful preparation number for Update/DS/DQ form in all inner most
/// loops. One successful preparation will put one common base out of loop,
@@ -570,6 +571,9 @@
if (!LARSCEV || LARSCEV->getLoop() != L)
continue;
+ // Mark that we have candidates for preparing.
+ HasCandidateForPrepare = true;
+
if (isValidCandidate(&J, PtrValue, PointerElementType))
addOneCandidate(&J, LSCEV, Buckets, MaxCandidateNum);
}
@@ -1046,6 +1050,8 @@
return ST && ST->hasP9Vector() && (PointerElementType->isVectorTy());
};
+ HasCandidateForPrepare = false;
+
// Collect buckets of comparable addresses used by loads and stores for update
// form.
SmallVector<Bucket, 16> UpdateFormBuckets =
@@ -1054,6 +1060,9 @@
// Prepare for update form.
if (!UpdateFormBuckets.empty())
MadeChange |= updateFormPrep(L, UpdateFormBuckets);
+ else if (!HasCandidateForPrepare)
+ // If no candidate for preparing, return early.
+ return MadeChange;
// Collect buckets of comparable addresses used by loads and stores for DS
// form.
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