Re: [PATCH, x86] Generate vector -1 with pcmpeq

[Evan Cheng]

Ping?

Evan

On Oct 28, 2005, at 1:10 PM, Evan Cheng wrote:

> Hi,
>
> This patch allows vector constant -1 be generated with a pcmpeq  
> instruction instead of a load.
>
> For example:
>
> __m128i set1_32bit() {
>         return _mm_set1_epi32(-1);
> }
>
>     .size    set1_16bit, .-set1_16bit
> .globl set1_32bit
>     .type    set1_32bit, @function
> set1_32bit:
>     pushl    %ebp
>     movl    %esp, %ebp
>     pcmpeqw    %xmm0, %xmm0
>     popl    %ebp
>     ret
>
>
> 2005-10-28  Evan Cheng  <evan.cheng@xxxxxxxxx>
>
>     * config/i386/i386-protos.h (ix86_const_vector_all_ones_operand)
>     Declare
>     * config/i386/i386.c (ix86_const_vector_all_ones_operand) New  
> function.
>     (standard_sse_constant_p) Return true for constant 0 or vector  
> constant
>     all one's.
>     (standard_sse_constant_opcode) New function to return the opcode
>     associated with standard_sse_constant_p.
>     (ix86_expand_vector_move) Also check for vector constant all  
> one's.
>     * config/i386/predicates.md (vector_all_ones_operand) True if  
> vector
>     constant all one's.
>     (vector_move_operand) True if vector_all_ones_operand is true.
>     * config/i386/sse.md (*mov<mode>_internal) Use
>     standard_sse_constant_opcode.
>     (*movv4sf_internal) Use standard_sse_constant_opcode.
>     (*movv2df_internal) Use standard_sse_constant_opcode.
>     (*vec_setv4sf_0) Added condition ! 
> ix86_const_vector_all_ones_operand.
>     (sse2_loadlpd) Added condition ! 
> ix86_const_vector_all_ones_operand.
>     (*vec_concatv2df) Added condition ! 
> ix86_const_vector_all_ones_operand.
>     (*vec_concatv2di) Added condition ! 
> ix86_const_vector_all_ones_operand.
>
>
> <patch.fsf.4283414.txt>
>
> Evan