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author | Paul E. Murphy <murphyp@linux.vnet.ibm.com> | 2016-08-08 15:58:28 -0500 |
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committer | Paul E. Murphy <murphyp@linux.vnet.ibm.com> | 2016-08-19 11:29:43 -0500 |
commit | 4482ff226e4b286ab171f3c5841ae1f7e61780cd (patch) | |
tree | 69bf06744f290b3656ad238c0b5dd700c850f9e9 /sysdeps/ieee754/ldbl-96/gamma_productl.c | |
parent | 01ee387015a2075c45a4e1ad45d39e50b5a6d40b (diff) | |
download | glibc-4482ff226e4b286ab171f3c5841ae1f7e61780cd.tar.gz glibc-4482ff226e4b286ab171f3c5841ae1f7e61780cd.tar.xz glibc-4482ff226e4b286ab171f3c5841ae1f7e61780cd.zip |
Merge common usage of mul_split function
A number of files share identical code for the mul_split function. This moves the duplicated function mul_split into its own header, and refactors the fma usage into a single selection macro. Likewise, mul_split when used by a long double implementation is renamed mul_splitl for clarity.
Diffstat (limited to 'sysdeps/ieee754/ldbl-96/gamma_productl.c')
-rw-r--r-- | sysdeps/ieee754/ldbl-96/gamma_productl.c | 34 |
1 files changed, 2 insertions, 32 deletions
diff --git a/sysdeps/ieee754/ldbl-96/gamma_productl.c b/sysdeps/ieee754/ldbl-96/gamma_productl.c index 849b57d95d..8ad045263b 100644 --- a/sysdeps/ieee754/ldbl-96/gamma_productl.c +++ b/sysdeps/ieee754/ldbl-96/gamma_productl.c @@ -18,37 +18,7 @@ #include <math.h> #include <math_private.h> -#include <float.h> - -/* Calculate X * Y exactly and store the result in *HI + *LO. It is - given that the values are small enough that no overflow occurs and - large enough (or zero) that no underflow occurs. */ - -static inline void -mul_split (long double *hi, long double *lo, long double x, long double y) -{ -#ifdef __FP_FAST_FMAL - /* Fast built-in fused multiply-add. */ - *hi = x * y; - *lo = __builtin_fmal (x, y, -*hi); -#elif defined FP_FAST_FMAL - /* Fast library fused multiply-add, compiler before GCC 4.6. */ - *hi = x * y; - *lo = __fmal (x, y, -*hi); -#else - /* Apply Dekker's algorithm. */ - *hi = x * y; -# define C ((1LL << (LDBL_MANT_DIG + 1) / 2) + 1) - long double x1 = x * C; - long double y1 = y * C; -# undef C - x1 = (x - x1) + x1; - y1 = (y - y1) + y1; - long double x2 = x - x1; - long double y2 = y - y1; - *lo = (((x1 * y1 - *hi) + x1 * y2) + x2 * y1) + x2 * y2; -#endif -} +#include <mul_splitl.h> /* Compute the product of X + X_EPS, X + X_EPS + 1, ..., X + X_EPS + N - 1, in the form R * (1 + *EPS) where the return value R is an @@ -68,7 +38,7 @@ __gamma_productl (long double x, long double x_eps, int n, long double *eps) { *eps += x_eps / (x + i); long double lo; - mul_split (&ret, &lo, ret, x + i); + mul_splitl (&ret, &lo, ret, x + i); *eps += lo / ret; } return ret; |