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vc4: DCE instructions with a NULL destination.

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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.
This commit is contained in:
Eric Anholt 2016-06-03 15:06:52 -07:00
parent 2a8973fb78
commit aa76ba6f2f
1 changed files with 3 additions and 2 deletions
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5
src/gallium/drivers/vc4/vc4_opt_dead_code.c
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@ -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)) {