radeonsi: implement ARB_shader_group_vote

[mesa.git] / src / gallium / drivers / radeonsi / si_shader.c

diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index ec063ad9028772f6961d6eff038b4ae489ff79d8..874535a6b773c28d6f984a80065e721150b226e4 100644 (file)
--- 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;