[LLVMbugs] [Bug 4459] New: Stackifier asserts

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4459

           Summary: Stackifier asserts
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Running llc -march=x86 on 

---------------------------
declare double @ceil(double)

declare void @test(i32)

define void @test2() {
entry:
        %0 = call double @ceil(double undef)
        %1 = fptosi double %0 to i32
        call void asm sideeffect "fistpl $0",
"=*m,{st},~{dirflag},~{fpsr},~{flags},~{st}"(i32* undef, double undef)
        call void @test(i32 %1 )
        unreachable
}
----------------------------

causes

/usr/local/espindola/llvm/llvm/lib/Target/X86/X86FloatingPoint.cpp:129:
void<unnamed>::FPS::moveToTop(unsigned int,
llvm::ilist_iterator<llvm::MachineInstr>): Assertion `RegMap[RegOnTop] <
StackTop' failed.


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