diff options
author | Ruiling Song <ruiling.song@intel.com> | 2014-12-09 10:24:43 +0800 |
---|---|---|
committer | Zhigang Gong <zhigang.gong@intel.com> | 2014-12-15 09:53:51 +0800 |
commit | 1795f38f18c3881201249a2502f20b63a0f0d47a (patch) | |
tree | 9f34ab149f9f7751a56e59af13ea328709bd8a91 | |
parent | 222030b4f30001679a7b19b1f8bad0653cc6be73 (diff) |
libocl: Fix precision of builtin tanpi.
This was originally submitted in f2111f368d9d7eeafe1762ecb0160d9da69d9214
But it was missed during libocl change. So add it back here.
Signed-off-by: Ruiling Song <ruiling.song@intel.com>
Reviewed-by: Zhigang Gong <zhigang.gong@linux.intel.com>
-rw-r--r-- | backend/src/libocl/tmpl/ocl_math.tmpl.cl | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/backend/src/libocl/tmpl/ocl_math.tmpl.cl b/backend/src/libocl/tmpl/ocl_math.tmpl.cl index 236fa0b1..ddfde830 100644 --- a/backend/src/libocl/tmpl/ocl_math.tmpl.cl +++ b/backend/src/libocl/tmpl/ocl_math.tmpl.cl @@ -1528,7 +1528,33 @@ OVERLOADABLE float nan(uint code) { return NAN; } OVERLOADABLE float __gen_ocl_internal_tanpi(float x) { - return native_tan(x * M_PI_F); + float sign = 1.0f; + int ix; + if(isinf(x)) return NAN; + if(x < 0.0f) { x = -x; sign = -1.0f; } + GEN_OCL_GET_FLOAT_WORD(ix, x); + if(x> 0x1.0p24) return 0.0f; + float m = __gen_ocl_internal_floor(x); + ix = (int)m; + m = x-m; + int n = __gen_ocl_internal_floor(m*4.0f); + if(m == 0.5f) { + return (ix&0x1) == 0 ? sign*INFINITY : sign*-INFINITY; + } + if(m == 0.0f) { + return (ix&0x1) == 0 ? 0.0f : -0.0f; + } + + switch(n) { + case 0: + return sign * __kernel_tanf(m*M_PI_F, 0.0f, 1); + case 1: + return sign * 1.0f/__kernel_tanf((0.5f-m)*M_PI_F, 0.0f, 1); + case 2: + return sign * 1.0f/__kernel_tanf((0.5f-m)*M_PI_F, 0.0f, 1); + default: + return sign * -1.0f*__kernel_tanf((1.0f-m)*M_PI_F, 0.0f, 1); + } } OVERLOADABLE float __gen_ocl_internal_cbrt(float x) { /* copied from fdlibm */ |