case X86::FpSET_ST0_32:
case X86::FpSET_ST0_64:
case X86::FpSET_ST0_80: {
- unsigned RegOnTop = getStackEntry(0);
+ unsigned Op0 = getFPReg(MI->getOperand(0));
+
// FpSET_ST0_80 is generated by copyRegToReg for both function return
// and inline assembly with the "st" constrain. In the latter case,
// it is possible for ST(0) to be alive after this instruction.
- if (!MI->killsRegister(X86::FP0 + RegOnTop)) {
- // Duplicate ST0
+ if (!MI->killsRegister(X86::FP0 + Op0)) {
+ // Duplicate Op0
duplicateToTop(0, 7 /*temp register*/, I);
+ } else {
+ moveToTop(Op0, I);
}
--StackTop; // "Forget" we have something on the top of stack!
break;
--- /dev/null
+; RUN: llvm-as < %s | llc -march=x86
+; PR4485
+
+define void @test(x86_fp80* %a) {
+entry:
+ %0 = load x86_fp80* %a, align 16
+ %1 = fmul x86_fp80 %0, 0xK4006B400000000000000
+ %2 = fmul x86_fp80 %1, 0xK4012F424000000000000
+ tail call void asm sideeffect "fistpl $0", "{st},~{st}"(x86_fp80 %2)
+ %3 = load x86_fp80* %a, align 16
+ %4 = fmul x86_fp80 %3, 0xK4006B400000000000000
+ %5 = fmul x86_fp80 %4, 0xK4012F424000000000000
+ tail call void asm sideeffect "fistpl $0", "{st},~{st}"(x86_fp80 %5)
+ ret void
+}