[Beignet] [PATCH 1/7] replace fabs with llvm intrinsic.

[xionghu.luo at intel.com]

From: Luo Xionghu <xionghu.luo at intel.com>

translate native fabs to llvm.fabs for fast path.

Signed-off-by: Luo Xionghu <xionghu.luo at intel.com>
---
 backend/src/libocl/tmpl/ocl_math.tmpl.cl   | 2 +-
 backend/src/llvm/llvm_gen_backend.cpp      | 2 --
 backend/src/llvm/llvm_gen_ocl_function.hxx | 1 -
 3 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/backend/src/libocl/tmpl/ocl_math.tmpl.cl b/backend/src/libocl/tmpl/ocl_math.tmpl.cl
index 2ed7b31..681e70c 100644
--- a/backend/src/libocl/tmpl/ocl_math.tmpl.cl
+++ b/backend/src/libocl/tmpl/ocl_math.tmpl.cl
@@ -23,7 +23,7 @@
 
 extern constant int __ocl_math_fastpath_flag;
 
-PURE CONST float __gen_ocl_fabs(float x);
+CONST float __gen_ocl_fabs(float x) __asm("llvm.fabs" ".f32");
 CONST float __gen_ocl_sin(float x) __asm("llvm.sin" ".f32");
 CONST float __gen_ocl_cos(float x) __asm("llvm.cos" ".f32");
 CONST float __gen_ocl_sqrt(float x) __asm("llvm.sqrt" ".f32");
diff --git a/backend/src/llvm/llvm_gen_backend.cpp b/backend/src/llvm/llvm_gen_backend.cpp
index c0ff1d1..a42ee40 100644
--- a/backend/src/llvm/llvm_gen_backend.cpp
+++ b/backend/src/llvm/llvm_gen_backend.cpp
@@ -2673,7 +2673,6 @@ namespace gbe
       case GEN_OCL_POW:
       case GEN_OCL_RCP:
       case GEN_OCL_ABS:
-      case GEN_OCL_FABS:
       case GEN_OCL_RNDZ:
       case GEN_OCL_RNDE:
       case GEN_OCL_RNDU:
@@ -3077,7 +3076,6 @@ namespace gbe
           }
           case GEN_OCL_RSQ: this->emitUnaryCallInst(I,CS,ir::OP_RSQ); break;
           case GEN_OCL_RCP: this->emitUnaryCallInst(I,CS,ir::OP_RCP); break;
-          case GEN_OCL_FABS: this->emitUnaryCallInst(I,CS,ir::OP_ABS); break;
           case GEN_OCL_RNDZ: this->emitUnaryCallInst(I,CS,ir::OP_RNDZ); break;
           case GEN_OCL_RNDE: this->emitUnaryCallInst(I,CS,ir::OP_RNDE); break;
           case GEN_OCL_RNDU: this->emitUnaryCallInst(I,CS,ir::OP_RNDU); break;
diff --git a/backend/src/llvm/llvm_gen_ocl_function.hxx b/backend/src/llvm/llvm_gen_ocl_function.hxx
index 45358d0..8e37df9 100644
--- a/backend/src/llvm/llvm_gen_ocl_function.hxx
+++ b/backend/src/llvm/llvm_gen_ocl_function.hxx
@@ -19,7 +19,6 @@ DECL_LLVM_GEN_FUNCTION(GET_GLOBAL_OFFSET2, __gen_ocl_get_global_offset2)
 DECL_LLVM_GEN_FUNCTION(GET_WORK_DIM, __gen_ocl_get_work_dim)
 
 // Math function
-DECL_LLVM_GEN_FUNCTION(FABS, __gen_ocl_fabs)
 DECL_LLVM_GEN_FUNCTION(RSQ, __gen_ocl_rsqrt)
 DECL_LLVM_GEN_FUNCTION(POW, __gen_ocl_pow)
 DECL_LLVM_GEN_FUNCTION(RCP, __gen_ocl_rcp)
-- 
1.9.1