[Mesa-dev] [PATCH] i965: Don't mark dead instructions' sources live.

[Matt Turner]

Removes dead code from glsl-mat-from-int-ctor-03.shader_test.

Reported-by: Juan A. Suarez Romero <jasuarez at igalia.com>
---
 src/mesa/drivers/dri/i965/brw_fs_dead_code_eliminate.cpp   | 4 ++++
 src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_dead_code_eliminate.cpp b/src/mesa/drivers/dri/i965/brw_fs_dead_code_eliminate.cpp
index a50cf6f..6b4b602 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_dead_code_eliminate.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_dead_code_eliminate.cpp
@@ -109,6 +109,10 @@ fs_visitor::dead_code_eliminate()
             BITSET_CLEAR(flag_live, inst->flag_subreg);
          }
 
+         /* Don't mark dead instructions' sources as live */
+         if (inst->opcode == BRW_OPCODE_NOP)
+            continue;
+
          for (int i = 0; i < inst->sources; i++) {
             if (inst->src[i].file == VGRF) {
                int var = live_intervals->var_from_reg(inst->src[i]);
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp b/src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp
index 58aed81..369941b 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp
@@ -150,6 +150,10 @@ vec4_visitor::dead_code_eliminate()
                BITSET_CLEAR(flag_live, c);
          }
 
+         /* Don't mark dead instructions' sources as live */
+         if (inst->opcode == BRW_OPCODE_NOP)
+            continue;
+
          for (int i = 0; i < 3; i++) {
             if (inst->src[i].file == VGRF) {
                for (unsigned j = 0; j < inst->regs_read(i); j++) {
-- 
2.4.9