Add WIN_FTOL_* psudo-instructions to model the unique calling convention
used by the Win32 _ftol2 runtime function. Patch by Joe Groff!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151382 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FloatingPoint.cpp b/lib/Target/X86/X86FloatingPoint.cpp
index e3461c8..5c00388 100644
--- a/lib/Target/X86/X86FloatingPoint.cpp
+++ b/lib/Target/X86/X86FloatingPoint.cpp
@@ -1644,6 +1644,32 @@
return;
}
+ case X86::WIN_FTOL_32:
+ case X86::WIN_FTOL_64: {
+ MachineBasicBlock::iterator InsertPt = MI;
+
+ // Push the operand into ST0.
+ MachineOperand &Op = MI->getOperand(0);
+ assert(Op.isUse() && Op.isReg() &&
+ Op.getReg() >= X86::FP0 && Op.getReg() <= X86::FP6);
+ unsigned FPReg = getFPReg(Op);
+ if (Op.isKill())
+ moveToTop(FPReg, I);
+ else
+ duplicateToTop(FPReg, FPReg, I);
+
+ // Emit the call. This will pop the operand.
+ BuildMI(*MBB, I, MI->getDebugLoc(), TII->get(X86::CALLpcrel32))
+ .addExternalSymbol("_ftol2")
+ .addReg(X86::ST0, RegState::ImplicitKill)
+ .addReg(X86::EAX, RegState::Define | RegState::Implicit)
+ .addReg(X86::EDX, RegState::Define | RegState::Implicit)
+ .addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);
+ --StackTop;
+
+ break;
+ }
+
case X86::RET:
case X86::RETI:
// If RET has an FP register use operand, pass the first one in ST(0) and