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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2014-11-11 19:46:36 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2014-11-11 19:46:36 +0000 |
| commit | 71c70733b7528047a83811f429d36f4e53f6ba22 (patch) | |
| tree | d0bb6664a09ff2bb6b81815baa4a899e798a36c7 /lib/Target/X86/X86FrameLowering.cpp | |
| parent | 5cebd7cd1ff329d5d8e0c75eebd626638b5fcd60 (diff) | |
Use a 8 bit immediate when possible.
This fixes pr21529.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221700 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86FrameLowering.cpp')
| -rw-r--r-- | lib/Target/X86/X86FrameLowering.cpp | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/lib/Target/X86/X86FrameLowering.cpp b/lib/Target/X86/X86FrameLowering.cpp index 70487a11b39..6e6bedbc5fb 100644 --- a/lib/Target/X86/X86FrameLowering.cpp +++ b/lib/Target/X86/X86FrameLowering.cpp @@ -82,6 +82,17 @@ static unsigned getADDriOpcode(unsigned IsLP64, int64_t Imm) { } } +static unsigned getANDriOpcode(bool IsLP64, int64_t Imm) { + if (IsLP64) { + if (isInt<8>(Imm)) + return X86::AND64ri8; + return X86::AND64ri32; + } + if (isInt<8>(Imm)) + return X86::AND32ri8; + return X86::AND32ri; +} + static unsigned getLEArOpcode(unsigned IsLP64) { return IsLP64 ? X86::LEA64r : X86::LEA32r; } @@ -657,11 +668,12 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const { // able to calculate their offsets from the frame pointer). if (RegInfo->needsStackRealignment(MF)) { assert(HasFP && "There should be a frame pointer if stack is realigned."); + uint64_t Val = -MaxAlign; MachineInstr *MI = BuildMI(MBB, MBBI, DL, - TII.get(Uses64BitFramePtr ? X86::AND64ri32 : X86::AND32ri), StackPtr) + TII.get(getANDriOpcode(Uses64BitFramePtr, Val)), StackPtr) .addReg(StackPtr) - .addImm(-MaxAlign) + .addImm(Val) .setMIFlag(MachineInstr::FrameSetup); // The EFLAGS implicit def is dead. |