[Mesa-dev] [PATCH] radeonsi: use minnum and maxnum LLVM intrinsics for MIN and MAX opcodes

[Tom Stellard]

On Thu, Nov 20, 2014 at 10:21:07PM +0100, Marek Olšák wrote:
> From: Marek Olšák <marek.olsak at amd.com>
> 

Reviewed-by: Tom Stellard <thomas.stellard at amd.com>

> So far it has been compiled into pretty ugly code (8 instructions or so
> for either opcode).
> ---
>  src/gallium/drivers/radeonsi/si_shader.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
> index ee08d1a..973bac2 100644
> --- a/src/gallium/drivers/radeonsi/si_shader.c
> +++ b/src/gallium/drivers/radeonsi/si_shader.c
> @@ -2792,6 +2792,13 @@ int si_shader_create(struct si_screen *sscreen, struct si_shader *shader)
>  	bld_base->op_actions[TGSI_OPCODE_EMIT].emit = si_llvm_emit_vertex;
>  	bld_base->op_actions[TGSI_OPCODE_ENDPRIM].emit = si_llvm_emit_primitive;
>  
> +	if (HAVE_LLVM >= 0x0306) {
> +		bld_base->op_actions[TGSI_OPCODE_MAX].emit = build_tgsi_intrinsic_nomem;
> +		bld_base->op_actions[TGSI_OPCODE_MAX].intr_name = "llvm.maxnum.f32";
> +		bld_base->op_actions[TGSI_OPCODE_MIN].emit = build_tgsi_intrinsic_nomem;
> +		bld_base->op_actions[TGSI_OPCODE_MIN].intr_name = "llvm.minnum.f32";
> +	}
> +
>  	si_shader_ctx.radeon_bld.load_system_value = declare_system_value;
>  	si_shader_ctx.tokens = sel->tokens;
>  	tgsi_parse_init(&si_shader_ctx.parse, si_shader_ctx.tokens);
> -- 
> 2.1.0
> 
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