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Use 16-bit tMOVgpr2gpr instead of tMOVr to copy GPR registers in Thumb2 mode.

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llvm-svn: 78398
This commit is contained in:
Evan Cheng 2009-08-07 19:34:35 +00:00
parent 0dab4cc8a0
commit 9c51e8f1fa
2 changed files with 1 additions and 8 deletions
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2
lib/Target/ARM/README-Thumb2.txt
View File

@ -3,5 +3,3 @@
//===---------------------------------------------------------------------===//
We should be using ADD / SUB rd, sp, rm <shift> instructions.
copyRegToReg should use tMOVgpr2gpr instead of t2MOVr?

7
lib/Target/ARM/Thumb2InstrInfo.cpp
View File

@ -65,12 +65,7 @@ Thumb2InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
if (DestRC == ARM::GPRRegisterClass &&
SrcRC == ARM::GPRRegisterClass) {
// FIXME: Just use tMOVgpr2gpr since it's shorter?
if (SrcReg == ARM::SP || DestReg == ARM::SP)
BuildMI(MBB, I, DL, get(ARM::tMOVgpr2gpr), DestReg).addReg(SrcReg);
else
AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::t2MOVr),
DestReg).addReg(SrcReg)));
BuildMI(MBB, I, DL, get(ARM::tMOVgpr2gpr), DestReg).addReg(SrcReg);
return true;
} else if (DestRC == ARM::GPRRegisterClass &&
SrcRC == ARM::tGPRRegisterClass) {