i965/vec4: Simplify opt_reduce_swizzle() using the swizzle utils.

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

diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index ff0ef4b8f82d6b5103655ac3d7a288b8e676cd9d..51c965c4e77697d0b8452bfc4d333415ad3925c3 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -768,6 +768,28 @@ backend_reg::is_accumulator() const
           fixed_hw_reg.nr == BRW_ARF_ACCUMULATOR;
 }
 
+bool
+backend_instruction::is_commutative() const
+{
+   switch (opcode) {
+   case BRW_OPCODE_AND:
+   case BRW_OPCODE_OR:
+   case BRW_OPCODE_XOR:
+   case BRW_OPCODE_ADD:
+   case BRW_OPCODE_MUL:
+      return true;
+   case BRW_OPCODE_SEL:
+      /* MIN and MAX are commutative. */
+      if (conditional_mod == BRW_CONDITIONAL_GE ||
+          conditional_mod == BRW_CONDITIONAL_L) {
+         return true;
+      }
+      /* fallthrough */
+   default:
+      return false;
+   }
+}
+
 bool
 backend_instruction::is_3src() const
 {