Hi DJ,

You could file this in Bugzilla instead, with all required fields
filled in (host, target, compiler revision number, etc), and test
cases as text attachments ;-)

Ciao!
Steven



On Thu, Jul 2, 2009 at 11:30 PM, DJ Delorie<d...@redhat.com> wrote:
>
> When compiled with -frename-registers, this test case produces invalid
> code.  Specifically, the cpadd4.h opcode clobbers $c1 but the cpsub2.h
> assumes it still has the value "a" in it.  Compiling with
> -fno-rename-registers results in valid code.
>
> I've attached the full testcase and before/after dumps.
>
> ./cc1 -quiet -mivc2 dj.c -O2 -o dj.s -frename-registers -fverbose-asm
>
> cp_vector __attribute((vliw))
> func1( cp_vector a, cp_vector b )
> {
>        cp_vector c;
>
>        c = mep_cpabsu3_b(a,b);
>        mep_c0nop();
>        c = mep_cpadd3_b(a,c);
>        c = mep_cpsub3_b(a,c);
>        c = mep_cpabs3_b(c,b);
>        mep_c1nop();
>        c = mep_cpadd3_h(a,c);  <- 1
>        c = mep_cpabs3_h(c,b);
>        c = mep_cpsub3_h(c,a);  < -2
>        c = mep_cpadd3_w(c,c);
>
>        return c;
> }
>
>
> func1:
>        cpabsu3.b       $c8,$c1,$c2     ;# tmp149, a, b
>        c0nop
>        cpadd3.b        $c5,$c1,$c8     ;# tmp150, a, tmp149
>        cpsub3.b        $c4,$c1,$c5     ;# tmp151, a, tmp150
>        cpabs3.b        $c3,$c4,$c2     ;# tmp152, tmp151, b
>        c1nop
>        cpadd3.h        $c1,$c1,$c3     ;# tmp153, a, tmp152    <- 1 (clobbers 
> $c1)
>        cpabs3.h        $c2,$c1,$c2     ;# tmp154, tmp153, b
>        cpsub3.h        $c0,$c2,$c1     ;# tmp155, tmp154, a    <- 2 (expects 
> old $c1 value)
>        cpadd3.w        $c0,$c0,$c0     ;#, tmp155, tmp155
>        ret
>
> begin 644 dj.dap.tar.gz
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> `
> end
>

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