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tu: Only emit FS output regs for as many MRTs as we have (but at least 1).

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This seems to be what the blob does, should save a bit of CP overhead.
zink drawoverhead throughput on test 7 (shader change) +0.234668% +/-
0.148818% (n=25).

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17932>
This commit is contained in:
Emma Anholt 2022-08-03 15:17:50 -07:00 • committed by Marge Bot
parent 374d1ce491
commit 8ffb48c90a
1 changed files with 6 additions and 5 deletions
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11
src/freedreno/vulkan/tu_pipeline.c
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@ -1570,13 +1570,14 @@ tu6_emit_fs_outputs(struct tu_cs *cs,
smask_regid = ir3_find_output_regid(fs, FRAG_RESULT_SAMPLE_MASK);
stencilref_regid = ir3_find_output_regid(fs, FRAG_RESULT_STENCIL);
uint32_t fragdata_regid[8];
int output_reg_count = MAX2(mrt_count, 1);
uint32_t fragdata_regid[output_reg_count];
if (fs->color0_mrt) {
fragdata_regid[0] = ir3_find_output_regid(fs, FRAG_RESULT_COLOR);
for (uint32_t i = 1; i < ARRAY_SIZE(fragdata_regid); i++)
for (uint32_t i = 1; i < output_reg_count; i++)
fragdata_regid[i] = fragdata_regid[0];
} else {
for (uint32_t i = 0; i < ARRAY_SIZE(fragdata_regid); i++)
for (uint32_t i = 0; i < output_reg_count; i++)
fragdata_regid[i] = ir3_find_output_regid(fs, FRAG_RESULT_DATA0 + i);
}
@ -1589,8 +1590,8 @@ tu6_emit_fs_outputs(struct tu_cs *cs,
uint32_t fs_render_components = 0;
tu_cs_emit_pkt4(cs, REG_A6XX_SP_FS_OUTPUT_REG(0), 8);
for (uint32_t i = 0; i < ARRAY_SIZE(fragdata_regid); i++) {
tu_cs_emit_pkt4(cs, REG_A6XX_SP_FS_OUTPUT_REG(0), output_reg_count);
for (uint32_t i = 0; i < output_reg_count; i++) {
tu_cs_emit(cs, A6XX_SP_FS_OUTPUT_REG_REGID(fragdata_regid[i]) |
(COND(fragdata_regid[i] & HALF_REG_ID,
A6XX_SP_FS_OUTPUT_REG_HALF_PRECISION)));