diff options
| -rw-r--r-- | src/compiler/nir/nir_builder.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/compiler/nir/nir_builder.h b/src/compiler/nir/nir_builder.h index c6e80e729a8..253ca5941cb 100644 --- a/src/compiler/nir/nir_builder.h +++ b/src/compiler/nir/nir_builder.h @@ -497,8 +497,16 @@ nir_swizzle(nir_builder *build, nir_ssa_def *src, const unsigned *swiz, assert(num_components <= NIR_MAX_VEC_COMPONENTS); nir_alu_src alu_src = { NIR_SRC_INIT }; alu_src.src = nir_src_for_ssa(src); - for (unsigned i = 0; i < num_components && i < NIR_MAX_VEC_COMPONENTS; i++) + + bool is_identity_swizzle = true; + for (unsigned i = 0; i < num_components && i < NIR_MAX_VEC_COMPONENTS; i++) { + if (swiz[i] != i) + is_identity_swizzle = false; alu_src.swizzle[i] = swiz[i]; + } + + if (num_components == src->num_components && is_identity_swizzle) + return src; return use_fmov ? nir_fmov_alu(build, alu_src, num_components) : nir_imov_alu(build, alu_src, num_components); |