using better algorithm
Signed-off-by: Homer Hsing <[email protected]>
---
backend/src/ocl_stdlib.tmpl.h | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/backend/src/ocl_stdlib.tmpl.h b/backend/src/ocl_stdlib.tmpl.h
index 3df893a..fdccf83 100644
--- a/backend/src/ocl_stdlib.tmpl.h
+++ b/backend/src/ocl_stdlib.tmpl.h
@@ -1452,7 +1452,11 @@ INLINE_OVERLOADABLE float __gen_ocl_internal_atanh(float
x) {
return 0.5f * native_sqrt((1 + x) / (1 - x));
}
INLINE_OVERLOADABLE float __gen_ocl_internal_copysign(float x, float y) {
- return x * y < 0 ? -x : x;
+ union { unsigned u; float f; } ux, uy;
+ ux.f = x;
+ uy.f = y;
+ ux.u = (ux.u & 0x7fffffff) | (uy.u & 0x80000000u);
+ return ux.f;
}
INLINE_OVERLOADABLE float __gen_ocl_internal_erf(float x) {
return M_2_SQRTPI_F * (x - __gen_ocl_pow(x, 3) / 3 + __gen_ocl_pow(x, 5) /
10 - __gen_ocl_pow(x, 7) / 42 + __gen_ocl_pow(x, 9) / 216);
--
1.8.3.2
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