diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gallium/drivers/vc4/vc4_opt_vpm.c | 74 | ||||
| -rw-r--r-- | src/gallium/drivers/vc4/vc4_qir.c | 2 | ||||
| -rw-r--r-- | src/gallium/drivers/vc4/vc4_qir.h | 2 |
3 files changed, 71 insertions, 7 deletions
diff --git a/src/gallium/drivers/vc4/vc4_opt_vpm.c b/src/gallium/drivers/vc4/vc4_opt_vpm.c index 0fcf1e5c6dd..d15b0c1a39f 100644 --- a/src/gallium/drivers/vc4/vc4_opt_vpm.c +++ b/src/gallium/drivers/vc4/vc4_opt_vpm.c @@ -24,14 +24,16 @@ /** * @file vc4_opt_vpm.c * - * This modifies instructions that generate the value consumed by a VPM write - * to write directly into the VPM. + * This modifies instructions that: + * 1. exclusively consume a value read from the VPM to directly read the VPM if + * other operands allow it. + * 2. generate the value consumed by a VPM write to write directly into the VPM. */ #include "vc4_qir.h" bool -qir_opt_vpm_writes(struct vc4_compile *c) +qir_opt_vpm(struct vc4_compile *c) { if (c->stage == QSTAGE_FRAG) return false; @@ -52,8 +54,70 @@ qir_opt_vpm_writes(struct vc4_compile *c) } for (int i = 0; i < qir_get_op_nsrc(inst->op); i++) { - if (inst->src[i].file == QFILE_TEMP) - use_count[inst->src[i].index]++; + if (inst->src[i].file == QFILE_TEMP) { + uint32_t temp = inst->src[i].index; + use_count[temp]++; + } + } + } + + /* For instructions reading from a temporary that contains a VPM read + * result, try to move the instruction up in place of the VPM read. + */ + list_for_each_entry(struct qinst, inst, &c->instructions, link) { + if (!inst || qir_is_multi_instruction(inst)) + continue; + + if (qir_depends_on_flags(inst) || inst->sf) + continue; + + if (qir_has_side_effects(c, inst) || + qir_has_side_effect_reads(c, inst) || + qir_is_tex(inst)) + continue; + + for (int j = 0; j < qir_get_op_nsrc(inst->op); j++) { + if (inst->src[j].file != QFILE_TEMP || + inst->src[j].pack) + continue; + + uint32_t temp = inst->src[j].index; + + /* Since VPM reads pull from a FIFO, we only get to + * read each VPM entry once (unless we reset the read + * pointer). That means we can't copy-propagate a VPM + * read to multiple locations. + */ + if (use_count[temp] != 1) + continue; + + struct qinst *mov = c->defs[temp]; + if (!mov || + (mov->op != QOP_MOV && + mov->op != QOP_FMOV && + mov->op != QOP_MMOV) || + mov->src[0].file != QFILE_VPM) { + continue; + } + + uint32_t temps = 0; + for (int k = 0; k < qir_get_op_nsrc(inst->op); k++) { + if (inst->src[k].file == QFILE_TEMP) + temps++; + } + + /* The instruction is safe to reorder if its other + * sources are independent of previous instructions + */ + if (temps == 1) { + list_del(&inst->link); + inst->src[j] = mov->src[0]; + list_replace(&mov->link, &inst->link); + c->defs[temp] = NULL; + free(mov); + progress = true; + break; + } } } diff --git a/src/gallium/drivers/vc4/vc4_qir.c b/src/gallium/drivers/vc4/vc4_qir.c index f9eb0e151c5..65f0067c61e 100644 --- a/src/gallium/drivers/vc4/vc4_qir.c +++ b/src/gallium/drivers/vc4/vc4_qir.c @@ -526,7 +526,7 @@ qir_optimize(struct vc4_compile *c) OPTPASS(qir_opt_copy_propagation); OPTPASS(qir_opt_dead_code); OPTPASS(qir_opt_small_immediates); - OPTPASS(qir_opt_vpm_writes); + OPTPASS(qir_opt_vpm); if (!progress) break; diff --git a/src/gallium/drivers/vc4/vc4_qir.h b/src/gallium/drivers/vc4/vc4_qir.h index bae31768bd8..4f39d72f552 100644 --- a/src/gallium/drivers/vc4/vc4_qir.h +++ b/src/gallium/drivers/vc4/vc4_qir.h @@ -484,7 +484,7 @@ bool qir_opt_copy_propagation(struct vc4_compile *c); bool qir_opt_cse(struct vc4_compile *c); bool qir_opt_dead_code(struct vc4_compile *c); bool qir_opt_small_immediates(struct vc4_compile *c); -bool qir_opt_vpm_writes(struct vc4_compile *c); +bool qir_opt_vpm(struct vc4_compile *c); void vc4_nir_lower_blend(struct vc4_compile *c); void vc4_nir_lower_io(struct vc4_compile *c); nir_ssa_def *vc4_nir_get_state_uniform(struct nir_builder *b, |