[LLVMbugs] [Bug 21931] New: inline-asm-fpstack.ll fails -verify-machineinstrs

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21931

            Bug ID: 21931
           Summary: inline-asm-fpstack.ll fails -verify-machineinstrs
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: jfb at google.com
                CC: jfb at google.com, llvmbugs at cs.uiuc.edu,
                    t.p.northover at gmail.com
    Classification: Unclassified

Produces the following output:

llc ./llvm/test/CodeGen/X86/inline-asm-fpstack.ll -verify-machineinstrs
-mcpu=generic -mtriple=i386-apple-darwin -no-integrated-as
    .section    __TEXT,__text,regular,pure_instructions
    .globl    _test1
    .align    4, 0x90
_test1:                                 ## @test1
    .cfi_startproc
## BB#0:
    ## InlineAsm Start
    fld0
    ## InlineAsm End
    retl
    .cfi_endproc

    .globl    _test2
    .align    4, 0x90
_test2:                                 ## @test2
    .cfi_startproc
## BB#0:
    ## InlineAsm Start
    fld0
    ## InlineAsm End
    retl
    .cfi_endproc


# After Greedy Register Allocator
# Machine code for function test3: Post SSA
Frame Objects:
  fi#-1: size=10, align=16, fixed, at location [SP+4]

0B    BB#0: derived from LLVM BB %0
16B        %vreg0<def> = LD_Fp80m <fi#-1>, 1, %noreg, 0, %noreg,
%FPSW<imp-def,dead>; mem:LD10[FixedStack-1](align=16) RFP80:%vreg0
32B        %FP0<def> = COPY %vreg0; RFP80:%vreg0
48B        INLINEASM <es:frob > [sideeffect] [attdialect], $0:[reguse], %FP0,
$1:[clobber], %FP0<earlyclobber,imp-def,dead>, $2:[clobber],
%EFLAGS<earlyclobber,imp-def,dead>
64B        RETL

# End machine code for function test3.

*** Bad machine code: No live segment at use ***
- function:    test3
- basic block: BB#0  (0x43ee2e0) [0B;80B)
- instruction: 48B    INLINEASM <es:frob > [sideeffect] [attdialect],
$0:[reguse], %FP0, $1:[clobber], %FP0<earlyclobber,imp-def,dead>, $2:[clobber],
%EFLAGS<earlyclobber,imp-def,dead>
- operand 3:   %FP0
48B is not live in FP0 [32r,32d:1)[48e,48d:0)  0 at 48e 1 at 32r
LLVM ERROR: Found 1 machine code errors.

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