added fast math APIs

1. Added fast math apis for sin, cos, tan, sincos
2. Added test for trig math functions
3. Added logarithm fast math
4. Changed how hipGetDevice, hipDeviceGetCacheConfig emit errors

Change-Id: Ie6ab594ddd5853cbe85e39a2f6d3479a807fa323

include/hip/hcc_detail/hip_runtime.h

@@ -478,7 +478,7 @@ __host__ __device__ int max(int arg1, int arg2);
 __device__ __attribute__((address_space(3))) void* __get_dynamicgroupbaseptr();
 
 //TODO - add a couple fast math operations here, the set here will grow :
-__device__ float __cosf(float x);
+
 __device__ float __expf(float x);
 __device__ float __frsqrt_rn(float x);
 __device__ float __fsqrt_rd(float x);
@@ -486,11 +486,13 @@ __device__ float __fsqrt_rn(float x);
 __device__ float __fsqrt_ru(float x);
 __device__ float __fsqrt_rz(float x);
 __device__ float __log10f(float x);
-__device__ float __log2f(float x);
+//__device__ float __log2f(float x);
 __device__ float __logf(float x);
 __device__ float __powf(float base, float exponent);
 __device__ void __sincosf(float x, float *s, float *c) ;
-__device__ float __sinf(float x);
+extern __attribute__((const)) float __sinf(float) __asm("llvm.sin.f32");
+extern __attribute__((const)) float __cosf(float) __asm("llvm.cos.f32");
+extern __attribute__((const)) float __log2f(float) __asm("llvm.log2.f32");
 __device__ float __tanf(float x);
 __device__ float __dsqrt_rd(double x);
 __device__ float __dsqrt_rn(double x);