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i965: make use of nir_lower_returns() for GL 

Fixes two new piglit tests:

spec/glsl-1.10/execution/vs-nested-return-sibling-loop.shader_test
spec/glsl-1.10/execution/vs-nested-return-sibling-loop2.shader_test

shader-db results for BDW:

total instructions in shared programs: 12903158 -> 12903134 (-0.00%)
instructions in affected programs: 27100 -> 27076 (-0.09%)
helped: 32
HURT: 6

total cycles in shared programs: 294922518 -> 294922804 (0.00%)
cycles in affected programs: 4372828 -> 4373114 (0.01%)
helped: 31
HURT: 8

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Timothy Arceri 2016-12-09 16:49:10 +11:00
parent f20ba7ad44
commit 3321eb4c36
2 changed files with 2 additions and 6 deletions
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6
src/mesa/drivers/dri/i965/brw_link.cpp
View File

@ -145,12 +145,6 @@ process_glsl_ir(struct brw_context *brw,
brw_do_vector_splitting(shader->ir);
}
progress = do_lower_jumps(shader->ir, true, true,
true, /* main return */
false, /* continue */
false /* loops */
) || progress;
progress = do_common_optimization(shader->ir, true, true,
options, ctx->Const.NativeIntegers) || progress;
} while (progress);

2
src/mesa/drivers/dri/i965/brw_program.c
View File

@ -78,6 +78,8 @@ brw_create_nir(struct brw_context *brw,
if (shader_prog) {
nir = glsl_to_nir(shader_prog, stage, options);
nir_remove_dead_variables(nir, nir_var_shader_in | nir_var_shader_out);
nir_lower_returns(nir);
nir_validate_shader(nir);
NIR_PASS_V(nir, nir_lower_io_to_temporaries,
nir_shader_get_entrypoint(nir), true, false);
} else {