i965/fs: Add support for removing MOV.NZ instructions.

[mesa.git] / src / mesa / drivers / dri / i965 / brw_fs_cmod_propagation.cpp

diff --git a/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp b/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp
index 8a03315bc4c4071c45e620428b2eff36279f863e..ec9f812ea11440c996cda616bb366e40605218a3 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp
@@ -57,12 +57,20 @@ opt_cmod_propagation_local(fs_visitor *v, bblock_t *block)
    foreach_inst_in_block_reverse_safe(fs_inst, inst, block) {
       ip--;
 
-      if (inst->opcode != BRW_OPCODE_CMP ||
+      if ((inst->opcode != BRW_OPCODE_CMP &&
+           inst->opcode != BRW_OPCODE_MOV) ||
           inst->predicate != BRW_PREDICATE_NONE ||
           !inst->dst.is_null() ||
           inst->src[0].file != GRF ||
-          inst->src[0].abs ||
-          !inst->src[1].is_zero())
+          inst->src[0].abs)
+         continue;
+
+      if (inst->opcode == BRW_OPCODE_CMP && !inst->src[1].is_zero())
+         continue;
+
+      if (inst->opcode == BRW_OPCODE_MOV &&
+          (inst->conditional_mod != BRW_CONDITIONAL_NZ ||
+           inst->src[0].negate))
          continue;
 
       bool read_flag = false;
@@ -73,6 +81,15 @@ opt_cmod_propagation_local(fs_visitor *v, bblock_t *block)
                 scan_inst->dst.reg_offset != inst->src[0].reg_offset)
                break;
 
+            if (inst->opcode == BRW_OPCODE_MOV) {
+               if (!scan_inst->writes_flag())
+                  break;
+
+               inst->remove(block);
+               progress = true;
+               break;
+            }
+
             enum brw_conditional_mod cond =
                inst->src[0].negate ? brw_swap_cmod(inst->conditional_mod)
                                    : inst->conditional_mod;