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nvc0: don't overwrite phi sources at the end of a loop

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Except the reference to its own result.
This commit is contained in:
Christoph Bumiller 2011-02-19 14:14:40 +01:00
parent 728695b435
commit 3d190e44de
1 changed files with 5 additions and 1 deletions
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6
src/gallium/drivers/nvc0/nvc0_tgsi_to_nc.c
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@ -465,6 +465,7 @@ bld_loop_end(struct bld_context *bld, struct nv_basic_block *bb)
reg = (struct bld_register *)phi->target;
phi->target = NULL;
/* start with s == 1, src[0] is from outside the loop */
for (s = 1, n = 0; n < bb->num_in; ++n) {
if (bb->in_kind[n] != CFG_EDGE_BACK)
continue;
@ -476,8 +477,11 @@ bld_loop_end(struct bld_context *bld, struct nv_basic_block *bb)
for (i = 0; i < 4; ++i)
if (phi->src[i] && phi->src[i]->value == val)
break;
if (i == 4)
if (i == 4) {
/* skip values we do not want to replace */
for (; phi->src[s] && phi->src[s]->value != phi->def[0]; ++s);
nv_reference(bld->pc, phi, s++, val);
}
}
bld->pc->current_block = save;