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nir: Add posibility to not lower to source mod 'abs' for ops with three sources 

This is useful for r600 since there the abs source modifier is not supported
for ops with three sources

v2: Use correct logic to enable lowering to abs source mod (Eric Anhold)

Signed-off-by: Gert Wollny <gw.fossdev@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Gert Wollny 2019-02-02 18:38:17 +01:00
parent ce112fcc87
commit b7201a468d
2 changed files with 8 additions and 1 deletions
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3
src/compiler/nir/nir.h
View File

@ -3205,7 +3205,8 @@ bool nir_lower_atomics_to_ssbo(nir_shader *shader, unsigned ssbo_offset);
typedef enum {
nir_lower_int_source_mods = 1 << 0,
nir_lower_float_source_mods = 1 << 1,
nir_lower_all_source_mods = (1 << 2) - 1
nir_lower_triop_abs = 1 << 2,
nir_lower_all_source_mods = (1 << 3) - 1
} nir_lower_to_source_mods_flags;

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

@ -45,6 +45,9 @@ nir_lower_to_source_mods_block(nir_block *block,
nir_alu_instr *alu = nir_instr_as_alu(instr);
bool lower_abs = (nir_op_infos[alu->op].num_inputs < 3) ||
(options & nir_lower_triop_abs);
for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++) {
if (!alu->src[i].src.is_ssa)
continue;
@ -81,6 +84,9 @@ nir_lower_to_source_mods_block(nir_block *block,
if (!parent->src[0].src.is_ssa)
continue;
if (!lower_abs && parent->src[0].abs)
continue;
nir_instr_rewrite_src(instr, &alu->src[i].src, parent->src[0].src);
if (alu->src[i].abs) {
/* abs trumps both neg and abs, do nothing */