From 8cdbb1fe84de1f2606554c4f29ac8e741f68bf88 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 6 Apr 2004 03:23:00 +0000 Subject: [PATCH] Improve code for passing constant longs as arguments to function calls. 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 --- lib/Target/X86/InstSelectSimple.cpp | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp index 1d4b7c97e22..264a1373de0 100644 --- a/lib/Target/X86/InstSelectSimple.cpp +++ b/lib/Target/X86/InstSelectSimple.cpp @@ -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(Args[i].Val)) { + uint64_t Val = cast(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;