diff options
| author | Eric Anholt <[email protected]> | 2016-06-03 15:06:52 -0700 |
|---|---|---|
| committer | Eric Anholt <[email protected]> | 2016-07-04 16:33:22 -0700 |
| commit | aa76ba6f2fb0d6438b2b652d9fa466b6cf77fa31 (patch) | |
| tree | 91fff3be56248c36da2e80134fed1bd9866cc2c4 /src/gallium/drivers | |
| parent | 2a8973fb78026b830786aa74b07805730ae891ca (diff) | |
vc4: DCE instructions with a NULL destination.
I'm going to add an optimization for redundant SF update removal, which
will just remove the SF and leave us (in many cases) with an instruction
with a NULL destination and no side effects. Rather than teaching that
pass whether the whole instruction can be removed, leave that
responsibility to this pass.
Diffstat (limited to 'src/gallium/drivers')
| -rw-r--r-- | src/gallium/drivers/vc4/vc4_opt_dead_code.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/gallium/drivers/vc4/vc4_opt_dead_code.c b/src/gallium/drivers/vc4/vc4_opt_dead_code.c index d3562ee947e..ad51ed779ea 100644 --- a/src/gallium/drivers/vc4/vc4_opt_dead_code.c +++ b/src/gallium/drivers/vc4/vc4_opt_dead_code.c @@ -86,8 +86,9 @@ qir_opt_dead_code(struct vc4_compile *c) list_for_each_entry_safe_rev(struct qinst, inst, &c->instructions, link) { - if (inst->dst.file == QFILE_TEMP && - !used[inst->dst.index] && + if ((inst->dst.file == QFILE_NULL || + (inst->dst.file == QFILE_TEMP && + !used[inst->dst.index])) && !inst->sf && !qir_has_side_effects(c, inst) && !has_nonremovable_reads(c, inst)) { |