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Improve code for passing constant longs as arguments to function calls.

Browse Source 
For example, on this instruction:

        call void %test(long 1234)

Instead of this:
        mov %EAX, 1234
        mov %ECX, 0
        mov DWORD PTR [%ESP], %EAX
        mov DWORD PTR [%ESP + 4], %ECX
        call test

We now emit this:
        mov DWORD PTR [%ESP], 1234
        mov DWORD PTR [%ESP + 4], 0
        call test

llvm-svn: 12686
This commit is contained in:
Chris Lattner 2004-04-06 03:23:00 +00:00
parent 2738d6d4a4
commit 8cdbb1fe84
1 changed files with 13 additions and 5 deletions
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18
lib/Target/X86/InstSelectSimple.cpp
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@ -1339,11 +1339,19 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
}
break;
case cLong:
ArgReg = Args[i].Val ? getReg(Args[i].Val) : Args[i].Reg;
addRegOffset(BuildMI(BB, X86::MOV32mr, 5),
X86::ESP, ArgOffset).addReg(ArgReg);
addRegOffset(BuildMI(BB, X86::MOV32mr, 5),
X86::ESP, ArgOffset+4).addReg(ArgReg+1);
if (Args[i].Val && isa<ConstantInt>(Args[i].Val)) {
uint64_t Val = cast<ConstantInt>(Args[i].Val)->getRawValue();
addRegOffset(BuildMI(BB, X86::MOV32mi, 5),
X86::ESP, ArgOffset).addImm(Val & ~0U);
addRegOffset(BuildMI(BB, X86::MOV32mi, 5),
X86::ESP, ArgOffset+4).addImm(Val >> 32ULL);
} else {
ArgReg = Args[i].Val ? getReg(Args[i].Val) : Args[i].Reg;
addRegOffset(BuildMI(BB, X86::MOV32mr, 5),
X86::ESP, ArgOffset).addReg(ArgReg);
addRegOffset(BuildMI(BB, X86::MOV32mr, 5),
X86::ESP, ArgOffset+4).addReg(ArgReg+1);
}
ArgOffset += 4; // 8 byte entry, not 4.
break;