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ARMInstrInfo: Improve isSwiftFastImmShift

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

Reapply of 183256, should not have caused the tablegen segfault on linux either.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183314 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2013-06-05 14:59:36 +00:00
parent fcce70ad52
commit d87bd5627e
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.