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| author | Jim Grosbach <grosbach@apple.com> | 2012-02-24 00:53:11 +0000 |
|---|---|---|
| committer | Jim Grosbach <grosbach@apple.com> | 2012-02-24 00:53:11 +0000 |
| commit | d1b220a33b16d97ef4194b4da625ba1c57974dee (patch) | |
| tree | 694334e7c6a693e8d0837bc584cb92243c121c08 /lib/Target/ARM/Thumb2SizeReduction.cpp | |
| parent | fdf7c850321bba542e181ae035507d9c71d95364 (diff) | |
| download | llvm-d1b220a33b16d97ef4194b4da625ba1c57974dee.tar.gz llvm-d1b220a33b16d97ef4194b4da625ba1c57974dee.tar.bz2 llvm-d1b220a33b16d97ef4194b4da625ba1c57974dee.tar.xz | |
Make sure the regs are low regs for tMUL size reduction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151318 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/ARM/Thumb2SizeReduction.cpp')
| -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) |