diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_vec4_nir.cpp | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp index 923e2d30a4c..632e409fdf4 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp @@ -458,13 +458,28 @@ vec4_visitor::nir_emit_load_const(nir_load_const_instr *instr) dst_reg reg = dst_reg(GRF, alloc.allocate(1)); reg.type = BRW_REGISTER_TYPE_F; + unsigned remaining = brw_writemask_for_size(instr->def.num_components); + /* @FIXME: consider emitting vector operations to save some MOVs in * cases where the components are representable in 8 bits. - * By now, we emit a MOV for each component. + * For now, we emit a MOV for each distinct value. */ - for (unsigned i = 0; i < instr->def.num_components; ++i) { - reg.writemask = 1 << i; + for (unsigned i = 0; i < instr->def.num_components; i++) { + unsigned writemask = 1 << i; + + if ((remaining & writemask) == 0) + continue; + + for (unsigned j = i; j < instr->def.num_components; j++) { + if (instr->value.u[i] == instr->value.u[j]) { + writemask |= 1 << j; + } + } + + reg.writemask = writemask; emit(MOV(reg, src_reg(instr->value.f[i]))); + + remaining &= ~writemask; } /* Set final writemask */ |