diff options
Diffstat (limited to 'lib/Target/X86/X86FloatingPoint.cpp')
| -rw-r--r-- | lib/Target/X86/X86FloatingPoint.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/Target/X86/X86FloatingPoint.cpp b/lib/Target/X86/X86FloatingPoint.cpp index 0f2fbcc..ed4eb44 100644 --- a/lib/Target/X86/X86FloatingPoint.cpp +++ b/lib/Target/X86/X86FloatingPoint.cpp @@ -991,8 +991,13 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) { case X86::FpSET_ST0_32: case X86::FpSET_ST0_64: case X86::FpSET_ST0_80: - assert((StackTop == 1 || StackTop == 2) - && "Stack should have one or two element on it to return!"); + // 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 FP0 to be alive after this instruction. + if (!MI->killsRegister(X86::FP0)) { + // Duplicate ST0 + duplicateToTop(0, 0, I); + } --StackTop; // "Forget" we have something on the top of stack! break; case X86::FpSET_ST1_32: |
