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Thumb2 size reduction fix for tied operands of tMUL.

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The tied source operand of tMUL is the second source operand, not the
first like every other two-address thumb instruction. Special case it
in the size reduction pass to make sure we create the tMUL instruction
properly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151315 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2012-02-24 00:33:36 +00:00
parent 4bf6c19e94
commit fdf7c85032
4 changed files with 18 additions and 6 deletions
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14
lib/Target/ARM/Thumb2SizeReduction.cpp
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@@ -597,7 +597,19 @@ Thumb2SizeReduce::ReduceTo2Addr(MachineBasicBlock &MBB, MachineInstr *MI,
unsigned Reg0 = MI->getOperand(0).getReg();
unsigned Reg1 = MI->getOperand(1).getReg();
if (Reg0 != Reg1) {
// t2MUL is "special". The tied source operand is second, not first.
if (MI->getOpcode() == ARM::t2MUL) {
if (Reg0 != MI->getOperand(2).getReg()) {
// If the other operand also isn't the same as the destination, we
// can't reduce.
if (Reg1 != Reg0)
return false;
// Try to commute the operands to make it a 2-address instruction.
MachineInstr *CommutedMI = TII->commuteInstruction(MI);
if (!CommutedMI)
return false;
}
} else if (Reg0 != Reg1) {
// Try to commute the operands to make it a 2-address instruction.
unsigned CommOpIdx1, CommOpIdx2;
if (!TII->findCommutedOpIndices(MI, CommOpIdx1, CommOpIdx2) ||