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radeonsi: add a workaround for a compute VGPR-usage LLVM bug

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v2: use abort(), describe which LLVM version is affected

Cc: 12.0 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
(cherry picked from commit d227dbe272)
This commit is contained in:
Marek Olšák 2016-07-03 20:00:17 +02:00 • committed by Emil Velikov
parent cbdbf67f1c
commit 605063953d
1 changed files with 35 additions and 0 deletions
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35
src/gallium/drivers/radeonsi/si_shader.c
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@ -6567,6 +6567,41 @@ int si_compile_tgsi_shader(struct si_screen *sscreen,
radeon_llvm_dispose(&ctx.radeon_bld);
/* Validate SGPR and VGPR usage for compute to detect compiler bugs.
* LLVM 3.9svn has this bug.
*/
if (sel->type == PIPE_SHADER_COMPUTE) {
unsigned *props = sel->info.properties;
unsigned wave_size = 64;
unsigned max_vgprs = 256;
unsigned max_sgprs = sscreen->b.chip_class >= VI ? 800 : 512;
unsigned max_sgprs_per_wave = 128;
unsigned min_waves_per_cu =
DIV_ROUND_UP(props[TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH] *
props[TGSI_PROPERTY_CS_FIXED_BLOCK_HEIGHT] *
props[TGSI_PROPERTY_CS_FIXED_BLOCK_DEPTH],
wave_size);
unsigned min_waves_per_simd = DIV_ROUND_UP(min_waves_per_cu, 4);
max_vgprs = max_vgprs / min_waves_per_simd;
max_sgprs = MIN2(max_sgprs / min_waves_per_simd, max_sgprs_per_wave);
if (shader->config.num_sgprs > max_sgprs ||
shader->config.num_vgprs > max_vgprs) {
fprintf(stderr, "LLVM failed to compile a shader correctly: "
"SGPR:VGPR usage is %u:%u, but the hw limit is %u:%u\n",
shader->config.num_sgprs, shader->config.num_vgprs,
max_sgprs, max_vgprs);
/* Just terminate the process, because dependent
* shaders can hang due to bad input data, but use
* the env var to allow shader-db to work.
*/
if (!debug_get_bool_option("SI_PASS_BAD_SHADERS", false))
abort();
}
}
/* Add the scratch offset to input SGPRs. */
if (shader->config.scratch_bytes_per_wave)
shader->info.num_input_sgprs += 1; /* scratch byte offset */