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aco: only reserve sgprs for vcc if it's used

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pipeline-db (Vega):

Totals:
SGPRS: 5186302 -> 5075616 (-2.13 %)
VGPRS: 3704580 -> 3704580 (0.00 %)
Spilled SGPRs: 144859 -> 144859 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Scratch size: 4124 -> 4124 (0.00 %) dwords per thread
Code Size: 247315944 -> 247315944 (0.00 %) bytes
LDS: 1311 -> 1311 (0.00 %) blocks
Max Waves: 674560 -> 674562 (0.00 %)

Totals from affected shaders:
SGPRS: 536992 -> 426306 (-20.61 %)
VGPRS: 356404 -> 356404 (0.00 %)
Spilled SGPRs: 0 -> 0 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 8498748 -> 8498748 (0.00 %) bytes
LDS: 8 -> 8 (0.00 %) blocks
Max Waves: 113832 -> 113834 (0.00 %)

There are some small code size changes in a few RotTR shaders and a small
increase in max_waves in two Detroit: Become Human shaders.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3906>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3906>
This commit is contained in:
Rhys Perry
2020-02-21 12:23:28 +00:00
committed by Marge Bot
parent c6e0c062da
commit b088a4b113
3 changed files with 16 additions and 7 deletions
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src/amd/compiler/aco_instruction_selection_setup.cpp
-3
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@@ -1007,9 +1007,6 @@ setup_isel_context(Program* program,
program->sgpr_limit = 104;
}
/* TODO: we don't have to allocate VCC if we don't need it */
program->needs_vcc = true;
calc_min_waves(program);
program->vgpr_limit = get_addr_vgpr_from_waves(program, program->min_waves);
program->sgpr_limit = get_addr_sgpr_from_waves(program, program->min_waves);