[Mesa-dev] [PATCH 7/7] i965: Don't spill "smeared" registers.

[Kenneth Graunke]

From: Paul Berry <stereotype441 at gmail.com>

Fixes an assertion failure when compiling certain shaders that need both
pull constants and register spilling:

brw_eu_emit.c:204: validate_reg: Assertion `execsize >= width' failed.

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

Patch contents by Paul; commit message by me.

diff --git a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
index e7f11ae..a819ae0 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
@@ -317,11 +317,19 @@ fs_visitor::choose_spill_reg(struct ra_graph *g)
       for (unsigned int i = 0; i < 3; i++) {
 	 if (inst->src[i].file == GRF) {
 	    spill_costs[inst->src[i].reg] += loop_scale;
+
+            if (inst->src[i].smear >= 0) {
+               no_spill[inst->src[i].reg] = true;
+            }
 	 }
       }
 
       if (inst->dst.file == GRF) {
 	 spill_costs[inst->dst.reg] += inst->regs_written() * loop_scale;
+
+         if (inst->dst.smear >= 0) {
+            no_spill[inst->dst.reg] = true;
+         }
       }
 
       switch (inst->opcode) {
-- 
1.7.11.4