diff options
| -rw-r--r-- | src/glsl/nir/nir_lower_to_source_mods.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/glsl/nir/nir_lower_to_source_mods.c b/src/glsl/nir/nir_lower_to_source_mods.c index d6bf77f17c..7b4a0f6573 100644 --- a/src/glsl/nir/nir_lower_to_source_mods.c +++ b/src/glsl/nir/nir_lower_to_source_mods.c @@ -67,6 +67,13 @@ nir_lower_to_source_mods_block(nir_block *block, void *state) continue; } + /* We can only do a rewrite if the source we are copying is SSA. + * Otherwise, moving the read might invalidly reorder reads/writes + * on a register. + */ + if (!parent->src[0].src.is_ssa) + continue; + nir_instr_rewrite_src(instr, &alu->src[i].src, parent->src[0].src); if (alu->src[i].abs) { /* abs trumps both neg and abs, do nothing */ |