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-rw-r--r--src/compiler/nir/nir_gather_info.c19
-rw-r--r--src/compiler/shader_info.h8
2 files changed, 27 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_gather_info.c b/src/compiler/nir/nir_gather_info.c
index 51717cd6d7f..a7e258d6d9d 100644
--- a/src/compiler/nir/nir_gather_info.c
+++ b/src/compiler/nir/nir_gather_info.c
@@ -264,6 +264,14 @@ gather_intrinsic_info(nir_intrinsic_instr *instr, nir_shader *shader,
(1ull << nir_system_value_from_intrinsic(instr->intrinsic));
break;
+ case nir_intrinsic_quad_broadcast:
+ case nir_intrinsic_quad_swap_horizontal:
+ case nir_intrinsic_quad_swap_vertical:
+ case nir_intrinsic_quad_swap_diagonal:
+ if (shader->info.stage == MESA_SHADER_FRAGMENT)
+ shader->info.fs.needs_helper_invocations = true;
+ break;
+
case nir_intrinsic_end_primitive:
case nir_intrinsic_end_primitive_with_counter:
assert(shader->info.stage == MESA_SHADER_GEOMETRY);
@@ -284,6 +292,10 @@ gather_intrinsic_info(nir_intrinsic_instr *instr, nir_shader *shader,
static void
gather_tex_info(nir_tex_instr *instr, nir_shader *shader)
{
+ if (shader->info.stage == MESA_SHADER_FRAGMENT &&
+ nir_tex_instr_has_implicit_derivative(instr))
+ shader->info.fs.needs_helper_invocations = true;
+
switch (instr->op) {
case nir_texop_tg4:
shader->info.uses_texture_gather = true;
@@ -300,6 +312,13 @@ gather_alu_info(nir_alu_instr *instr, nir_shader *shader)
case nir_op_fddx:
case nir_op_fddy:
shader->info.uses_fddx_fddy = true;
+ /* Fall through */
+ case nir_op_fddx_fine:
+ case nir_op_fddy_fine:
+ case nir_op_fddx_coarse:
+ case nir_op_fddy_coarse:
+ if (shader->info.stage == MESA_SHADER_FRAGMENT)
+ shader->info.fs.needs_helper_invocations = true;
break;
default:
break;
diff --git a/src/compiler/shader_info.h b/src/compiler/shader_info.h
index f71b93e84d0..115dd01e2b9 100644
--- a/src/compiler/shader_info.h
+++ b/src/compiler/shader_info.h
@@ -189,6 +189,14 @@ typedef struct shader_info {
bool uses_discard;
/**
+ * True if this fragment shader requires helper invocations. This
+ * can be caused by the use of ALU derivative ops, texture
+ * instructions which do implicit derivatives, and the use of quad
+ * subgroup operations.
+ */
+ bool needs_helper_invocations;
+
+ /**
* Whether any inputs are declared with the "sample" qualifier.
*/
bool uses_sample_qualifier;