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[AArch64] This check is specific to merging instructions. NFC.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260283 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2016-02-09 21:20:12 +00:00
parent f0f8b1c60d
commit 3b3e0dc608
1 changed files with 4 additions and 4 deletions
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8
lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
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@ -1149,10 +1149,6 @@ AArch64LoadStoreOpt::findMatchingInsn(MachineBasicBlock::iterator I,
int Offset = getLdStOffsetOp(FirstMI).getImm();
bool IsNarrowStore = isNarrowStore(Opc);
// For narrow stores, find only the case where the stored value is WZR.
if (IsNarrowStore && Reg != AArch64::WZR)
return E;
// Early exit if the offset is not possible to match. (6 bits of positive
// range, plus allow an extra one in case we find a later insn that matches
// with Offset-1)
@ -1582,6 +1578,10 @@ bool AArch64LoadStoreOpt::tryToMergeLdStInst(
if (!isCandidateToMergeOrPair(MI))
return false;
// For narrow stores, find only the case where the stored value is WZR.
if (isNarrowStore(MI) && getLdStRegOp(MI).getReg() != AArch64::WZR)
return false;
// Look ahead up to LdStLimit instructions for a mergable instruction.
LdStPairFlags Flags;
MachineBasicBlock::iterator MergeMI = findMatchingInsn(MBBI, Flags, LdStLimit);