diff options
| -rw-r--r-- | src/gallium/drivers/radeonsi/si_shader.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c index c975fae..16346a1 100644 --- a/src/gallium/drivers/radeonsi/si_shader.c +++ b/src/gallium/drivers/radeonsi/si_shader.c @@ -5289,6 +5289,7 @@ static void si_llvm_emit_vertex( struct si_shader *shader = ctx->shader; struct tgsi_shader_info *info = &shader->selector->info; struct gallivm_state *gallivm = bld_base->base.gallivm; + struct lp_build_if_state if_state; LLVMValueRef soffset = LLVMGetParam(ctx->main_fn, SI_PARAM_GS2VS_OFFSET); LLVMValueRef gs_next_vertex; @@ -5306,19 +5307,28 @@ static void si_llvm_emit_vertex( ""); /* If this thread has already emitted the declared maximum number of - * vertices, kill it: excessive vertex emissions are not supposed to - * have any effect, and GS threads have no externally observable - * effects other than emitting vertices. + * vertices, skip the write: excessive vertex emissions are not + * supposed to have any effect. + * + * If the shader has no writes to memory, kill it instead. This skips + * further memory loads and may allow LLVM to skip to the end + * altogether. */ can_emit = LLVMBuildICmp(gallivm->builder, LLVMIntULE, gs_next_vertex, lp_build_const_int32(gallivm, shader->selector->gs_max_out_vertices), ""); - kill = lp_build_select(&bld_base->base, can_emit, - lp_build_const_float(gallivm, 1.0f), - lp_build_const_float(gallivm, -1.0f)); - lp_build_intrinsic(gallivm->builder, "llvm.AMDGPU.kill", - ctx->voidt, &kill, 1, 0); + bool use_kill = !info->writes_memory; + if (use_kill) { + kill = lp_build_select(&bld_base->base, can_emit, + lp_build_const_float(gallivm, 1.0f), + lp_build_const_float(gallivm, -1.0f)); + + lp_build_intrinsic(gallivm->builder, "llvm.AMDGPU.kill", + ctx->voidt, &kill, 1, 0); + } else { + lp_build_if(&if_state, gallivm, can_emit); + } for (i = 0; i < info->num_outputs; i++) { LLVMValueRef *out_ptr = @@ -5344,6 +5354,7 @@ static void si_llvm_emit_vertex( 1, 0, 1, 1, 0); } } + gs_next_vertex = lp_build_add(uint, gs_next_vertex, lp_build_const_int32(gallivm, 1)); @@ -5354,6 +5365,9 @@ static void si_llvm_emit_vertex( args[1] = LLVMGetParam(ctx->main_fn, SI_PARAM_GS_WAVE_ID); lp_build_intrinsic(gallivm->builder, "llvm.SI.sendmsg", ctx->voidt, args, 2, 0); + + if (!use_kill) + lp_build_endif(&if_state); } /* Cut one primitive from the geometry shader */ |