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ARMInstrInfo: Improve isSwiftFastImmShift

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An instruction with less than 3 inputs is trivially a fast immediate shift.

llvm-svn: 183256
This commit is contained in:
Arnold Schwaighofer 2013-06-04 22:15:43 +00:00
parent 10d37229fb
commit 81440608f7
1 changed files with 2 additions and 0 deletions
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2
lib/Target/ARM/ARMBaseInstrInfo.cpp
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@ -4152,6 +4152,8 @@ bool ARMBaseInstrInfo::hasNOP() const {
} }
bool ARMBaseInstrInfo::isSwiftFastImmShift(const MachineInstr *MI) const { bool ARMBaseInstrInfo::isSwiftFastImmShift(const MachineInstr *MI) const {
if (MI->getNumOperands() < 4)
return true;
unsigned ShOpVal = MI->getOperand(3).getImm(); unsigned ShOpVal = MI->getOperand(3).getImm();
unsigned ShImm = ARM_AM::getSORegOffset(ShOpVal); unsigned ShImm = ARM_AM::getSORegOffset(ShOpVal);
// Swift supports faster shifts for: lsl 2, lsl 1, and lsr 1. // Swift supports faster shifts for: lsl 2, lsl 1, and lsr 1.