c/3429: GCC-2.95.3 on target arc-elf32 generates bad code.

[francisco dot blasco at ds2 dot es]

>Number:         3429
>Category:       c
>Synopsis:       GCC-2.95.3 on target  arc-elf32 generates bad code.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 26 10:16:02 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     francisco.blasco@ds2.es
>Release:        gcc-2.95.3
>Organization:
>Environment:

>Description:
If you compiles GCC-2.95.3 for arc-elf32 target, it appears to work nicely.
But when you use the cross-compiler ans tries to compile next code:

int ll(int k)
{
  return k<0?1234:0;
}

It generates bad assembler code:

        .cpu base
__gnu_compiled_c:
        .section .text
        .align 4
        .global ll
        .type    ll,@function
ll:
        ; BEGIN PROLOGUE ; vars= 0, regs= 0, args= 0, extra= 0
        st %fp,[%sp]
        mov %fp,%sp
        ; END PROLOGUE
        sub.f 0,%r0,0
        mov %r0,1234
        mov.gt %r0,0   <<<<<<<<<<< BAD!!!!!!!!!
        ; EPILOGUE
        j.d %blink
        ld.a %fp,[%sp,0]
.Lfe1:
        .size    ll,.Lfe1-ll
        .ident  "GCC: (GNU) 2.95.3 20010315 (release)"

The instruction "mov.gt %r0, 0" must be "mov.ge %r0, 0".
>How-To-Repeat:
arc-elf32-gcc -S -O2 -o - kk3.c
>Fix:
I don't know. I learned to do some modifications to the arc.md file to add 
some new intructions, but I don't know where I must search.
I can try to fix it, but I believe I don't know enough the gcc code.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="kk3.c"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="kk3.c"

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