diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/ARM/Thumb2SizeReduction.cpp | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/lib/Target/ARM/Thumb2SizeReduction.cpp b/lib/Target/ARM/Thumb2SizeReduction.cpp index 4abff28f02..776d0eff5e 100644 --- a/lib/Target/ARM/Thumb2SizeReduction.cpp +++ b/lib/Target/ARM/Thumb2SizeReduction.cpp @@ -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) || |