Re: SSE ABI change proof for Jan's old patch

[Andrew Pinski <pinskia at physics dot uc dot edu>]

On Dec 29, 2003, at 23:59, Richard Henderson wrote:

> On Mon, Dec 29, 2003 at 08:50:27PM -0500, Andrew Pinski wrote:
> > Why do we want one for x86 or should we add one for PPC also?
>
> PPC has -mabi=altivec that explicitly changes the abi.

But on Darwin where -mabi=altivec is on by default, so this is not the 
case so that is
not quite true, see how there was no warning but an abi change.


#define  vector __attribute__((vector_size(16)))
vector float t()
{
  vector float g = (vector float){1.0, 2.0, 3.0, 4.0};
  return g;

}

[omni:src/objdir-arm/gcc] pinskia% ~/fsf-clean-nocheck/bin/gcc -O3 -S 
-o - test.c -maltivec -static

.data
.const
        .align 4
LC0:
        .long   1065353216
        .long   1073741824
        .long   1077936128
        .long   1082130432
.text
        .align 2
        .globl _t
_t:
        lis r3,ha16(LC0)
        la r2,lo16(LC0)(r3)
        lvx v2,0,r2
        blr
[omni:src/objdir-arm/gcc] pinskia% ~/fsf-clean-nocheck/bin/gcc -O3 -S 
-o - test.c -static

.text
        .align 2
        .globl _t
_t:
        lis r6,0x3f80
        lis r4,0x4040
        mr r7,r4
        mr r9,r6
        stmw r26,-24(r1)
        lis r12,0x4000
        lmw r26,-24(r1)
        mr r3,r9
        mr r4,r12
        mr r5,r7
        lis r6,0x4080
        blr


Thanks,
Andrew Pinski