ac/shader: scan if fragment shaders write memory

It's better to do that in ac_shader_info.

Signed-off-by: Samuel Pitoiset <[email protected]>
Reviewed-by: Bas Nieuwenhuizen <[email protected]>

4 files changed, 36 insertions, 13 deletions

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 581ccf63c9a..7b6d7bca9c1 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -4558,9 +4558,6 @@ static LLVMValueRef radv_load_ssbo(struct ac_shader_abi *abi,
 {
 	struct nir_to_llvm_context *ctx = nir_to_llvm_context_from_abi(abi);
 
-	if (write && ctx->stage == MESA_SHADER_FRAGMENT)
-		ctx->shader_info->fs.writes_memory = true;
-
 	return LLVMBuildLoad(ctx->builder, buffer_ptr, "");
 }
 
@@ -4591,9 +4588,6 @@ static LLVMValueRef radv_get_sampler_desc(struct ac_shader_abi *abi,
 
 	assert(base_index < layout->binding_count);
 
-	if (write && ctx->stage == MESA_SHADER_FRAGMENT)
-		ctx->shader_info->fs.writes_memory = true;
-
 	switch (desc_type) {
 	case AC_DESC_IMAGE:
 		type = ctx->ac.v8i32;
diff --git a/src/amd/common/ac_nir_to_llvm.h b/src/amd/common/ac_nir_to_llvm.h
index 1656289e06e..1484bf1d839 100644
--- a/src/amd/common/ac_nir_to_llvm.h
+++ b/src/amd/common/ac_nir_to_llvm.h
@@ -179,7 +179,6 @@ struct ac_shader_variant_info {
 			bool writes_stencil;
 			bool writes_sample_mask;
 			bool early_fragment_test;
-			bool writes_memory;
 			bool prim_id_input;
 			bool layer_input;
 		} fs;
diff --git a/src/amd/common/ac_shader_info.c b/src/amd/common/ac_shader_info.c
index 5716ec043d5..d771cd250dc 100644
--- a/src/amd/common/ac_shader_info.c
+++ b/src/amd/common/ac_shader_info.c
@@ -31,7 +31,7 @@ static void mark_sampler_desc(const nir_variable *var,
 }
 
 static void
-gather_intrinsic_info(const nir_intrinsic_instr *instr,
+gather_intrinsic_info(const nir_shader *nir, const nir_intrinsic_instr *instr,
 		      struct ac_shader_info *info)
 {
 	switch (instr->intrinsic) {
@@ -104,15 +104,43 @@ gather_intrinsic_info(const nir_intrinsic_instr *instr,
 		    dim == GLSL_SAMPLER_DIM_SUBPASS_MS)
 			info->ps.uses_input_attachments = true;
 		mark_sampler_desc(instr->variables[0]->var, info);
+
+		if (nir_intrinsic_image_store ||
+		    nir_intrinsic_image_atomic_add ||
+		    nir_intrinsic_image_atomic_min ||
+		    nir_intrinsic_image_atomic_max ||
+		    nir_intrinsic_image_atomic_and ||
+		    nir_intrinsic_image_atomic_or ||
+		    nir_intrinsic_image_atomic_xor ||
+		    nir_intrinsic_image_atomic_exchange ||
+		    nir_intrinsic_image_atomic_comp_swap) {
+			if (nir->info.stage == MESA_SHADER_FRAGMENT)
+				info->ps.writes_memory = true;
+		}
 		break;
 	}
+	case nir_intrinsic_store_ssbo:
+	case nir_intrinsic_ssbo_atomic_add:
+	case nir_intrinsic_ssbo_atomic_imin:
+	case nir_intrinsic_ssbo_atomic_umin:
+	case nir_intrinsic_ssbo_atomic_imax:
+	case nir_intrinsic_ssbo_atomic_umax:
+	case nir_intrinsic_ssbo_atomic_and:
+	case nir_intrinsic_ssbo_atomic_or:
+	case nir_intrinsic_ssbo_atomic_xor:
+	case nir_intrinsic_ssbo_atomic_exchange:
+	case nir_intrinsic_ssbo_atomic_comp_swap:
+		if (nir->info.stage == MESA_SHADER_FRAGMENT)
+			info->ps.writes_memory = true;
+		break;
 	default:
 		break;
 	}
 }
 
 static void
-gather_tex_info(const nir_tex_instr *instr, struct ac_shader_info *info)
+gather_tex_info(const nir_shader *nir, const nir_tex_instr *instr,
+		struct ac_shader_info *info)
 {
 	if (instr->sampler)
 		mark_sampler_desc(instr->sampler->var, info);
@@ -121,15 +149,16 @@ gather_tex_info(const nir_tex_instr *instr, struct ac_shader_info *info)
 }
 
 static void
-gather_info_block(const nir_block *block, struct ac_shader_info *info)
+gather_info_block(const nir_shader *nir, const nir_block *block,
+		  struct ac_shader_info *info)
 {
 	nir_foreach_instr(instr, block) {
 		switch (instr->type) {
 		case nir_instr_type_intrinsic:
-			gather_intrinsic_info(nir_instr_as_intrinsic(instr), info);
+			gather_intrinsic_info(nir, nir_instr_as_intrinsic(instr), info);
 			break;
 		case nir_instr_type_tex:
-			gather_tex_info(nir_instr_as_tex(instr), info);
+			gather_tex_info(nir, nir_instr_as_tex(instr), info);
 			break;
 		default:
 			break;
@@ -165,6 +194,6 @@ ac_nir_shader_info_pass(const struct nir_shader *nir,
 		gather_info_input_decl(nir, variable, info);
 
 	nir_foreach_block(block, func->impl) {
-		gather_info_block(block, info);
+		gather_info_block(nir, block, info);
 	}
 }
diff --git a/src/amd/common/ac_shader_info.h b/src/amd/common/ac_shader_info.h
index 2be61679fc7..59b749576aa 100644
--- a/src/amd/common/ac_shader_info.h
+++ b/src/amd/common/ac_shader_info.h
@@ -42,6 +42,7 @@ struct ac_shader_info {
 		bool force_persample;
 		bool needs_sample_positions;
 		bool uses_input_attachments;
+		bool writes_memory;
 	} ps;
 	struct {
 		bool uses_grid_size;