radeonsi: implement ARB_shader_group_vote

Reviewed-by: Marek Olšák <[email protected]>

4 files changed, 87 insertions, 2 deletions

diff --git a/docs/features.txt b/docs/features.txt
index d707f011850..1e145e1ddad 100644
--- a/docs/features.txt
+++ b/docs/features.txt
@@ -295,7 +295,7 @@ Khronos, ARB, and OES extensions that are not part of any OpenGL or OpenGL ES ve
   GL_ARB_shader_ballot                                  not started
   GL_ARB_shader_clock                                   DONE (i965/gen7+, radeonsi)
   GL_ARB_shader_draw_parameters                         DONE (i965, nvc0, radeonsi)
-  GL_ARB_shader_group_vote                              DONE (nvc0)
+  GL_ARB_shader_group_vote                              DONE (nvc0, radeonsi)
   GL_ARB_shader_stencil_export                          DONE (i965/gen9+, radeonsi, softpipe, llvmpipe, swr)
   GL_ARB_shader_viewport_layer_array                    DONE (i965/gen6+)
   GL_ARB_sparse_buffer                                  not started
diff --git a/docs/relnotes/17.1.0.html b/docs/relnotes/17.1.0.html
index c2a0166f72c..a11a37ffb8c 100644
--- a/docs/relnotes/17.1.0.html
+++ b/docs/relnotes/17.1.0.html
@@ -46,6 +46,7 @@ Note: some of the new features are only available with certain drivers.
 <ul>
 <li>GL_ARB_gpu_shader_int64 on i965/gen8+, nvc0, radeonsi, softpipe, llvmpipe</li>
 <li>GL_ARB_shader_clock on radeonsi</li>
+<li>GL_ARB_shader_group_vote on radeonsi</li>
 <li>GL_ARB_transform_feedback2 on i965/gen6</li>
 <li>GL_ARB_transform_feedback_overflow_query on i965/gen6+</li>
 <li>Geometry shaders enabled on swr</li>
diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 2369471aa58..8aae11d3be4 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -424,6 +424,9 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TGSI_CLOCK:
 		return HAVE_LLVM >= 0x0309;
 
+	case PIPE_CAP_TGSI_VOTE:
+		return HAVE_LLVM >= 0x0400;
+
 	case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
 		return !SI_BIG_ENDIAN && sscreen->b.info.has_userptr;
 
@@ -480,7 +483,6 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 	case PIPE_CAP_VERTEXID_NOBASE:
 	case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
-	case PIPE_CAP_TGSI_VOTE:
 	case PIPE_CAP_MAX_WINDOW_RECTANGLES:
 	case PIPE_CAP_NATIVE_FENCE_FD:
 	case PIPE_CAP_TGSI_FS_FBFETCH:
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index ec063ad9028..874535a6b77 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -5125,6 +5125,84 @@ static void build_interp_intrinsic(const struct lp_build_tgsi_action *action,
 	}
 }
 
+static LLVMValueRef si_emit_ballot(struct si_shader_context *ctx,
+				   LLVMValueRef value)
+{
+	struct gallivm_state *gallivm = &ctx->gallivm;
+	LLVMValueRef args[3] = {
+		value,
+		ctx->i32_0,
+		LLVMConstInt(ctx->i32, LLVMIntNE, 0)
+	};
+
+	if (LLVMTypeOf(value) != ctx->i32)
+		args[0] = LLVMBuildBitCast(gallivm->builder, value, ctx->i32, "");
+
+	return lp_build_intrinsic(gallivm->builder,
+				  "llvm.amdgcn.icmp.i32",
+				  ctx->i64, args, 3,
+				  LP_FUNC_ATTR_NOUNWIND |
+				  LP_FUNC_ATTR_READNONE |
+				  LP_FUNC_ATTR_CONVERGENT);
+}
+
+static void vote_all_emit(
+	const struct lp_build_tgsi_action *action,
+	struct lp_build_tgsi_context *bld_base,
+	struct lp_build_emit_data *emit_data)
+{
+	struct si_shader_context *ctx = si_shader_context(bld_base);
+	struct gallivm_state *gallivm = &ctx->gallivm;
+	LLVMValueRef active_set, vote_set;
+	LLVMValueRef tmp;
+
+	active_set = si_emit_ballot(ctx, ctx->i32_1);
+	vote_set = si_emit_ballot(ctx, emit_data->args[0]);
+
+	tmp = LLVMBuildICmp(gallivm->builder, LLVMIntEQ, vote_set, active_set, "");
+	emit_data->output[emit_data->chan] =
+		LLVMBuildSExt(gallivm->builder, tmp, ctx->i32, "");
+}
+
+static void vote_any_emit(
+	const struct lp_build_tgsi_action *action,
+	struct lp_build_tgsi_context *bld_base,
+	struct lp_build_emit_data *emit_data)
+{
+	struct si_shader_context *ctx = si_shader_context(bld_base);
+	struct gallivm_state *gallivm = &ctx->gallivm;
+	LLVMValueRef vote_set;
+	LLVMValueRef tmp;
+
+	vote_set = si_emit_ballot(ctx, emit_data->args[0]);
+
+	tmp = LLVMBuildICmp(gallivm->builder, LLVMIntNE,
+			    vote_set, LLVMConstInt(ctx->i64, 0, 0), "");
+	emit_data->output[emit_data->chan] =
+		LLVMBuildSExt(gallivm->builder, tmp, ctx->i32, "");
+}
+
+static void vote_eq_emit(
+	const struct lp_build_tgsi_action *action,
+	struct lp_build_tgsi_context *bld_base,
+	struct lp_build_emit_data *emit_data)
+{
+	struct si_shader_context *ctx = si_shader_context(bld_base);
+	struct gallivm_state *gallivm = &ctx->gallivm;
+	LLVMValueRef active_set, vote_set;
+	LLVMValueRef all, none, tmp;
+
+	active_set = si_emit_ballot(ctx, ctx->i32_1);
+	vote_set = si_emit_ballot(ctx, emit_data->args[0]);
+
+	all = LLVMBuildICmp(gallivm->builder, LLVMIntEQ, vote_set, active_set, "");
+	none = LLVMBuildICmp(gallivm->builder, LLVMIntEQ,
+			     vote_set, LLVMConstInt(ctx->i64, 0, 0), "");
+	tmp = LLVMBuildOr(gallivm->builder, all, none, "");
+	emit_data->output[emit_data->chan] =
+		LLVMBuildSExt(gallivm->builder, tmp, ctx->i32, "");
+}
+
 static unsigned si_llvm_get_stream(struct lp_build_tgsi_context *bld_base,
 				       struct lp_build_emit_data *emit_data)
 {
@@ -6574,6 +6652,10 @@ static void si_init_shader_ctx(struct si_shader_context *ctx,
 	bld_base->op_actions[TGSI_OPCODE_DDX_FINE].emit = si_llvm_emit_ddxy;
 	bld_base->op_actions[TGSI_OPCODE_DDY_FINE].emit = si_llvm_emit_ddxy;
 
+	bld_base->op_actions[TGSI_OPCODE_VOTE_ALL].emit = vote_all_emit;
+	bld_base->op_actions[TGSI_OPCODE_VOTE_ANY].emit = vote_any_emit;
+	bld_base->op_actions[TGSI_OPCODE_VOTE_EQ].emit = vote_eq_emit;
+
 	bld_base->op_actions[TGSI_OPCODE_EMIT].emit = si_llvm_emit_vertex;
 	bld_base->op_actions[TGSI_OPCODE_ENDPRIM].emit = si_llvm_emit_primitive;
 	bld_base->op_actions[TGSI_OPCODE_BARRIER].emit = si_llvm_emit_barrier;