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[AArch64] Hoist commonly failing check. NFC.

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llvm-svn: 249011
This commit is contained in:
Chad Rosier 2015-10-01 13:43:05 +00:00
parent 9d0cd90088
commit 469748b81f
1 changed files with 6 additions and 6 deletions
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12
lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
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@ -904,6 +904,12 @@ MachineBasicBlock::iterator AArch64LoadStoreOpt::findMatchingUpdateInsnForward(
unsigned BaseReg = getLdStBaseOp(MemMI).getReg();
int MIUnscaledOffset = getLdStOffsetOp(MemMI).getImm() * getMemScale(MemMI);
// Scan forward looking for post-index opportunities. Updating instructions
// can't be formed if the memory instruction doesn't have the offset we're
// looking for.
if (MIUnscaledOffset != UnscaledOffset)
return E;
// If the base register overlaps a destination register, we can't
// merge the update.
bool IsPairedInsn = isPairedLdSt(MemMI);
@ -913,12 +919,6 @@ MachineBasicBlock::iterator AArch64LoadStoreOpt::findMatchingUpdateInsnForward(
return E;
}
// Scan forward looking for post-index opportunities. Updating instructions
// can't be formed if the memory instruction doesn't have the offset we're
// looking for.
if (MIUnscaledOffset != UnscaledOffset)
return E;
// Track which registers have been modified and used between the first insn
// (inclusive) and the second insn.
BitVector ModifiedRegs, UsedRegs;