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

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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
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@ -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 */