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nir/lower_to_source_mods: Stop turning add, sat, and neg into mov

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Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Jason Ekstrand 2019-05-06 11:17:40 -05:00
parent 2a39788d03
commit cd73b6174b
2 changed files with 19 additions and 40 deletions
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53
src/compiler/nir/nir_lower_to_source_mods.c
View File

@ -78,13 +78,13 @@ nir_lower_to_source_mods_block(nir_block *block,
case nir_type_float:
if (!(options & nir_lower_float_source_mods))
continue;
if (parent->op != nir_op_fmov)
if (parent->op != nir_op_fabs && parent->op != nir_op_fneg)
continue;
break;
case nir_type_int:
if (!(options & nir_lower_int_source_mods))
continue;
if (parent->op != nir_op_imov)
if (parent->op != nir_op_iabs && parent->op != nir_op_ineg)
continue;
break;
default:
@ -98,10 +98,19 @@ nir_lower_to_source_mods_block(nir_block *block,
if (!parent->src[0].src.is_ssa)
continue;
if (!lower_abs && parent->src[0].abs)
if (!lower_abs && (parent->op == nir_op_fabs &&
parent->op == nir_op_iabs))
continue;
nir_instr_rewrite_src(instr, &alu->src[i].src, parent->src[0].src);
/* Apply any modifiers that come from the parent opcode */
if (parent->op == nir_op_fneg || parent->op == nir_op_ineg)
alu_src_consume_negate(&alu->src[i]);
if (parent->op == nir_op_fabs || parent->op == nir_op_iabs)
alu_src_consume_abs(&alu->src[i]);
/* Apply modifiers from the parent source */
if (parent->src[0].negate)
alu_src_consume_negate(&alu->src[i]);
if (parent->src[0].abs)
@ -120,41 +129,6 @@ nir_lower_to_source_mods_block(nir_block *block,
progress = true;
}
if (options & nir_lower_float_source_mods) {
switch (alu->op) {
case nir_op_fsat:
alu->op = nir_op_fmov;
alu->dest.saturate = true;
break;
case nir_op_fneg:
alu->op = nir_op_fmov;
alu->src[0].negate = !alu->src[0].negate;
break;
case nir_op_fabs:
alu->op = nir_op_fmov;
alu->src[0].abs = true;
alu->src[0].negate = false;
break;
default:
break;
}
}
if (options & nir_lower_int_source_mods) {
switch (alu->op) {
case nir_op_ineg:
alu->op = nir_op_imov;
alu->src[0].negate = !alu->src[0].negate;
break;
case nir_op_iabs:
alu->op = nir_op_imov;
alu->src[0].abs = true;
alu->src[0].negate = false;
break;
default:
break;
}
}
/* We've covered sources. Now we're going to try and saturate the
* destination if we can.
*/
@ -188,8 +162,7 @@ nir_lower_to_source_mods_block(nir_block *block,
continue;
}
if (child_alu->op != nir_op_fsat &&
!(child_alu->op == nir_op_fmov && child_alu->dest.saturate)) {
if (child_alu->op != nir_op_fsat) {
all_children_are_sat = false;
continue;
}

6
src/compiler/nir/nir_validate.c
View File

@ -217,6 +217,9 @@ validate_alu_src(nir_alu_instr *instr, unsigned index, validate_state *state)
{
nir_alu_src *src = &instr->src[index];
if (instr->op == nir_op_fmov || instr->op == nir_op_imov)
assert(!src->abs && !src->negate);
unsigned num_components = nir_src_num_components(src->src);
for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++) {
validate_assert(state, src->swizzle[i] < NIR_MAX_VEC_COMPONENTS);
@ -319,6 +322,9 @@ validate_alu_dest(nir_alu_instr *instr, validate_state *state)
{
nir_alu_dest *dest = &instr->dest;
if (instr->op == nir_op_fmov || instr->op == nir_op_imov)
assert(!dest->saturate);
unsigned dest_size = nir_dest_num_components(dest->dest);
/*
* validate that the instruction doesn't write to components not in the