[Beignet] [PATCH] backend: improve add zero pattern

[rander.wang]

	remove the negation check for adding zero.
	it also can be applied this optimization

Signed-off-by: rander.wang <rander.wang at intel.com>
---
 backend/src/backend/gen_insn_selection_optimize.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/backend/src/backend/gen_insn_selection_optimize.cpp b/backend/src/backend/gen_insn_selection_optimize.cpp
index 1020b7f..3b76817 100644
--- a/backend/src/backend/gen_insn_selection_optimize.cpp
+++ b/backend/src/backend/gen_insn_selection_optimize.cpp
@@ -307,8 +307,8 @@ namespace gbe
     if (insn.opcode == SEL_OP_ADD) {
       GenRegister src0 = insn.src(0);
       GenRegister src1 = insn.src(1);
-      if ((src0.negation && src1.file == GEN_IMMEDIATE_VALUE && src1.value.f == 0.0f) ||
-          (src1.negation && src0.file == GEN_IMMEDIATE_VALUE && src0.value.f == 0.0f))
+      if ((src1.file == GEN_IMMEDIATE_VALUE && src1.value.f == 0.0f) ||
+          (src0.file == GEN_IMMEDIATE_VALUE && src0.value.f == 0.0f))
         addToReplaceInfoMap(insn);
     }
   }
-- 
2.7.4