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freedreno/ir3: fix crash

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Fixes a crash in dEQP-GLES3.functional.shaders.fragdepth.compare.fragcoord_z

Fixes: 0d240c2214 freedreno/ir3: don't fetch unused tex components
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Rob Clark 2018-12-10 10:39:28 -05:00
parent 3e8e033f4c
commit c19c4bf488
1 changed files with 8 additions and 14 deletions
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22
src/freedreno/ir3/ir3_depth.c
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@ -177,27 +177,21 @@ remove_unused_by_block(struct ir3_block *block)
if (instr->opc == OPC_META_FO) {
struct ir3_instruction *src = ssa(instr->regs[1]);
if (src->regs[0]->wrmask > 1) {
unsigned newn, lastn;
lastn = util_last_bit(src->regs[0]->wrmask);
src->regs[0]->wrmask &= ~(1 << instr->fo.off);
newn = util_last_bit(src->regs[0]->wrmask);
/* prune no-longer needed right-neighbors. We could
* probably do the same for left-neighbors (ie. tex
* fetch that only need .yw components), but that
* makes RA a bit more confusing than it already is
*/
if (newn < lastn) {
struct ir3_instruction *n = ir3_neighbor_first(instr);
for (unsigned i = 1; i < newn; i++) {
n = n->cp.right;
}
// XXX I don't think n should be null here!
if (n) {
debug_assert(n->cp.right->flags & IR3_INSTR_UNUSED);
n->cp.right = NULL;
}
struct ir3_instruction *n = instr;
while (n && n->cp.right)
n = n->cp.right;
while (n->flags & IR3_INSTR_UNUSED) {
n = n->cp.left;
if (!n)
break;
n->cp.right = NULL;
}
}
}