diff options
| -rw-r--r-- | src/compiler/nir/nir_lower_vec_to_movs.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/compiler/nir/nir_lower_vec_to_movs.c b/src/compiler/nir/nir_lower_vec_to_movs.c index 711ddd38bda..8b24376b0a5 100644 --- a/src/compiler/nir/nir_lower_vec_to_movs.c +++ b/src/compiler/nir/nir_lower_vec_to_movs.c @@ -230,6 +230,7 @@ lower_vec_to_movs_block(nir_block *block, nir_function_impl *impl) continue; /* The loop */ } + bool vec_had_ssa_dest = vec->dest.dest.is_ssa; if (vec->dest.dest.is_ssa) { /* Since we insert multiple MOVs, we have a register destination. */ nir_register *reg = nir_local_reg_create(impl); @@ -263,7 +264,11 @@ lower_vec_to_movs_block(nir_block *block, nir_function_impl *impl) if (!(vec->dest.write_mask & (1 << i))) continue; - if (!(finished_write_mask & (1 << i))) + /* Coalescing moves the register writes from the vec up to the ALU + * instruction in the source. We can only do this if the original + * vecN had an SSA destination. + */ + if (vec_had_ssa_dest && !(finished_write_mask & (1 << i))) finished_write_mask |= try_coalesce(vec, i); if (!(finished_write_mask & (1 << i))) |