diff options
| -rw-r--r-- | lib/Target/X86/X86RegisterInfo.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp index fc87a02e3b..909a79cee7 100644 --- a/lib/Target/X86/X86RegisterInfo.cpp +++ b/lib/Target/X86/X86RegisterInfo.cpp @@ -113,10 +113,13 @@ const unsigned* X86RegisterInfo::getCallerSaveRegs() const { } void X86RegisterInfo::emitPrologue(MachineFunction &MF, - unsigned numBytes) const { + unsigned NumBytes) const { MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB MachineBasicBlock::iterator MBBI = MBB.begin(); + // Round stack allocation up to a nice alignment to keep the stack aligned + NumBytes = (NumBytes + 3) & ~3; + // PUSH ebp MachineInstr *MI = BuildMI(X86::PUSHr32, 1).addReg(X86::EBP); MBBI = ++MBB.insert(MBBI, MI); @@ -126,7 +129,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF, MBBI = ++MBB.insert(MBBI, MI); // adjust stack pointer: ESP -= numbytes - MI = BuildMI(X86::SUBri32, 2, X86::ESP).addReg(X86::ESP).addZImm(numBytes); + MI = BuildMI(X86::SUBri32, 2, X86::ESP).addReg(X86::ESP).addZImm(NumBytes); MBBI = ++MBB.insert(MBBI, MI); } |