From: Eric Anholt <eric@anholt.net>
Date: Fri, 23 Oct 2015 15:34:01 +0000 (+0100)
Subject: vc4: Don't try to CSE non-SSA instructions.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=817a7eb588c7d6536cb469f4ca7447b49268bc00;p=mesa.git

vc4: Don't try to CSE non-SSA instructions.

This can happen when we're doing destination packing -- we don't know
what's in the rest of the register.

Signed-off-by: Eric Anholt <eric@anholt.net>
---

diff --git a/src/gallium/drivers/vc4/vc4_opt_cse.c b/src/gallium/drivers/vc4/vc4_opt_cse.c
index 0e5480ea781..8b4d429074c 100644
--- a/src/gallium/drivers/vc4/vc4_opt_cse.c
+++ b/src/gallium/drivers/vc4/vc4_opt_cse.c
@@ -65,6 +65,7 @@ vc4_find_cse(struct vc4_compile *c, struct hash_table *ht,
              struct qinst *inst, uint32_t sf_count)
 {
         if (inst->dst.file != QFILE_TEMP ||
+            !c->defs[inst->dst.index] ||
             inst->op == QOP_MOV ||
             qir_get_op_nsrc(inst->op) > 4) {
                 return NULL;