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radv: only export clip/cull distances if PS reads them

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The only exception is the GS copy shader which emits them
unconditionally.

Totals from affected shaders:
SGPRS: 71320 -> 71008 (-0.44 %)
VGPRS: 54372 -> 54240 (-0.24 %)
Code Size: 2952628 -> 2941368 (-0.38 %) bytes
Max Waves: 9689 -> 9723 (0.35 %)

This helps Dota2, Doom, GTAV and Hitman 2.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Samuel Pitoiset
2019-06-26 16:35:44 +02:00
parent 1e9ccc5429
commit d5004f60be
3 changed files with 15 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
src/amd/vulkan/radv_nir_to_llvm.c
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@@ -2861,6 +2861,7 @@ radv_emit_streamout(struct radv_shader_context *ctx, unsigned stream)
static void
handle_vs_outputs_post(struct radv_shader_context *ctx,
bool export_prim_id, bool export_layer_id,
bool export_clip_dists,
struct radv_vs_output_info *outinfo)
{
uint32_t param_count = 0;
@@ -2917,9 +2918,11 @@ handle_vs_outputs_post(struct radv_shader_context *ctx,
memcpy(&pos_args[target - V_008DFC_SQ_EXP_POS],
&args, sizeof(args));
/* Export the clip/cull distances values to the next stage. */
radv_export_param(ctx, param_count, &slots[0], 0xf);
outinfo->vs_output_param_offset[location] = param_count++;
if (export_clip_dists) {
/* Export the clip/cull distances values to the next stage. */
radv_export_param(ctx, param_count, &slots[0], 0xf);
outinfo->vs_output_param_offset[location] = param_count++;
}
}
}
@@ -3446,6 +3449,7 @@ handle_shader_outputs_post(struct ac_shader_abi *abi, unsigned max_outputs,
else
handle_vs_outputs_post(ctx, ctx->options->key.vs.export_prim_id,
ctx->options->key.vs.export_layer_id,
ctx->options->key.vs.export_clip_dists,
&ctx->shader_info->vs.outinfo);
break;
case MESA_SHADER_FRAGMENT:
@@ -3463,6 +3467,7 @@ handle_shader_outputs_post(struct ac_shader_abi *abi, unsigned max_outputs,
else
handle_vs_outputs_post(ctx, ctx->options->key.tes.export_prim_id,
ctx->options->key.tes.export_layer_id,
ctx->options->key.tes.export_clip_dists,
&ctx->shader_info->tes.outinfo);
break;
default:
@@ -4117,7 +4122,7 @@ ac_gs_copy_shader_emit(struct radv_shader_context *ctx)
radv_emit_streamout(ctx, stream);
if (stream == 0) {
handle_vs_outputs_post(ctx, false, false,
handle_vs_outputs_post(ctx, false, false, true,
&ctx->shader_info->vs.outinfo);
}