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nir: Don't set writes_memory for reading XFB

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That's a read, not a write. Fixes optimizations getting disabled for fragment
shaders when linked with a shader producing transform feedback varyings.

Fixes: 85a723975b ("nir: add and gather shader_info::writes_memory")
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16285>
This commit is contained in:
Alyssa Rosenzweig
2022-05-02 13:59:55 -04:00
committed by Marge Bot
parent e3607e96bb
commit ca280b2283
1 changed files with 2 additions and 1 deletions
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src/compiler/nir/nir_gather_info.c
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@@ -930,7 +930,8 @@ nir_shader_gather_info(nir_shader *shader, nir_function_impl *entrypoint)
shader->info.tess.tcs_cross_invocation_outputs_read = 0;
}
shader->info.writes_memory = shader->info.has_transform_feedback_varyings;
if (shader->info.stage != MESA_SHADER_FRAGMENT)
shader->info.writes_memory = shader->info.has_transform_feedback_varyings;
void *dead_ctx = ralloc_context(NULL);
nir_foreach_block(block, entrypoint) {