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Mark that the _ftol2 function used by windows on x86 to handle fptoui modifies ECX. 

llvm-svn: 186787
This commit is contained in:
Craig Topper 2013-07-21 07:28:13 +00:00
parent f6bb6a464c
commit 8956fe0dbc
2 changed files with 5 additions and 3 deletions
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1
llvm/lib/Target/X86/X86FloatingPoint.cpp
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@ -1662,6 +1662,7 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
BuildMI(*MBB, I, MI->getDebugLoc(), TII->get(X86::CALLpcrel32))
.addExternalSymbol("_ftol2")
.addReg(X86::ST0, RegState::ImplicitKill)
.addReg(X86::ECX, RegState::ImplicitDefine)
.addReg(X86::EAX, RegState::Define | RegState::Implicit)
.addReg(X86::EDX, RegState::Define | RegState::Implicit)
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);

7
llvm/lib/Target/X86/X86InstrCompiler.td
View File

@ -129,12 +129,13 @@ def SEG_ALLOCA_64 : I<0, Pseudo, (outs GR64:$dst), (ins GR64:$size),
// The MSVC runtime contains an _ftol2 routine for converting floating-point
// to integer values. It has a strange calling convention: the input is
// popped from the x87 stack, and the return value is given in EDX:EAX. No
// other registers (aside from flags) are touched.
// popped from the x87 stack, and the return value is given in EDX:EAX. ECX is
// used as a temporary register. No other registers (aside from flags) are
// touched.
// Microsoft toolchains do not support 80-bit precision, so a WIN_FTOL_80
// variant is unnecessary.
let Defs = [EAX, EDX, EFLAGS], FPForm = SpecialFP in {
let Defs = [EAX, EDX, ECX, EFLAGS], FPForm = SpecialFP in {
def WIN_FTOL_32 : I<0, Pseudo, (outs), (ins RFP32:$src),
"# win32 fptoui",
[(X86WinFTOL RFP32:$src)]>,