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nir: Rename opt_undef_alu to opt_undef_csel; update comments.

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This better reflects what it does.  I plan to add other ALU
optimizations as well, so the old name would be confusing.

In preparation for that, also move the file comments about csels
above the opt_undef_csel function, and delete the ones about there
not being other optimizations.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Kenneth Graunke
2016-04-20 01:15:53 -07:00
parent a808ba5965
commit 49ea7454a1
1 changed files with 13 additions and 12 deletions
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25
src/compiler/nir/nir_opt_undef.c
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@@ -25,18 +25,17 @@
/** @file nir_opt_undef.c
*
* Handles optimization of operations involving ssa_undef. For now, we just
* make sure that csels between undef and some other value just give the other
* value (on the assumption that the condition's going to be choosing the
* defined value). This reduces work after if flattening when each side of
* the if is defining a variable.
*
* Some day, we may find some use for making other operations consuming an
* undef arg output undef, but I don't know of any cases currently.
* Handles optimization of operations involving ssa_undef.
*/
/**
* Turn conditional selects between an undef and some other value into a move
* of that other value (on the assumption that the condition's going to be
* choosing the defined value). This reduces work after if flattening when
* each side of the if is defining a variable.
*/
static bool
opt_undef_alu(nir_alu_instr *instr)
opt_undef_csel(nir_alu_instr *instr)
{
if (instr->op != nir_op_bcsel && instr->op != nir_op_fcsel)
return false;
@@ -80,9 +79,11 @@ nir_opt_undef(nir_shader *shader)
if (function->impl) {
nir_foreach_block(block, function->impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type == nir_instr_type_alu)
if (opt_undef_alu(nir_instr_as_alu(instr)))
progress = true;
if (instr->type == nir_instr_type_alu) {
nir_alu_instr *alu = nir_instr_as_alu(instr);
progress = opt_undef_csel(alu) || progress;
}
}
}