[LLVMbugs] [Bug 4484] New: yet another stackifier bug with inline asm

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4484

           Summary: yet another stackifier bug with inline asm
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llc
        AssignedTo: rafael.espindola at gmail.com
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu


the test

---------------------------------------------
declare x86_fp80 @ceil()

declare void @test(x86_fp80)

define void @test2(x86_fp80 %a) {
entry:
        %0 = call x86_fp80 @ceil()
        call void asm sideeffect "fistpl $0", "{st},~{st}"(x86_fp80 %a)
        call void @test(x86_fp80 %0)
        ret void
}
---------------------------------------------

Fails with

llc: /usr/local/espindola/llvm/llvm/lib/Target/X86/X86FloatingPoint.cpp:1149:
void<unnamed>::FPS::handleSpecialFP(llvm::ilist_iterator<llvm::MachineInstr>&):
Assertion `StackTop == 1 && FirstFPRegOp == getStackEntry(0) && "Top of stack
not the right register for RET!"' failed.


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