diff options
| -rw-r--r-- | lib/Target/ARM/Thumb2SizeReduction.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/Target/ARM/Thumb2SizeReduction.cpp b/lib/Target/ARM/Thumb2SizeReduction.cpp index 776d0eff5e..5ee5f4202e 100644 --- a/lib/Target/ARM/Thumb2SizeReduction.cpp +++ b/lib/Target/ARM/Thumb2SizeReduction.cpp @@ -599,7 +599,12 @@ Thumb2SizeReduce::ReduceTo2Addr(MachineBasicBlock &MBB, MachineInstr *MI, unsigned Reg1 = MI->getOperand(1).getReg(); // t2MUL is "special". The tied source operand is second, not first. if (MI->getOpcode() == ARM::t2MUL) { - if (Reg0 != MI->getOperand(2).getReg()) { + unsigned Reg2 = MI->getOperand(2).getReg(); + // Early exit if the regs aren't all low regs. + if (!isARMLowRegister(Reg0) || !isARMLowRegister(Reg1) + || !isARMLowRegister(Reg2)) + return false; + if (Reg0 != Reg2) { // If the other operand also isn't the same as the destination, we // can't reduce. if (Reg1 != Reg0) |