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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2018-04-03 16:49:33 +0100 |
|---|---|---|
| committer | Wilco Dijkstra <wdijkstr@arm.com> | 2018-04-03 16:52:18 +0100 |
| commit | e88ecbbfe836db5b6da809108759de4ca56be5e7 (patch) | |
| tree | 0302cf9e5ae61fc04225f67e81423df3f869aaa7 /sysdeps/ieee754/dbl-64/s_sin.c | |
| parent | aef3e2558a0ab0aff6d80f3e99ebe228321ab4b3 (diff) | |
| download | glibc-e88ecbbfe836db5b6da809108759de4ca56be5e7.zip glibc-e88ecbbfe836db5b6da809108759de4ca56be5e7.tar.gz glibc-e88ecbbfe836db5b6da809108759de4ca56be5e7.tar.bz2 | |
[PATCH 7/7] sin/cos slow paths: refactor sincos implementation
Refactor the sincos implementation - rather than rely on odd partial inlining
of preprocessed portions from sin and cos, explicitly write out the cases.
This makes sincos much easier to maintain and provides an additional 16-20%
speedup between 0 and 2^27. The overall speedup of sincos is 48% over this range.
Between 0 and PI it is 66% faster.
* sysdeps/ieee754/dbl-64/s_sin.c (__sin): Cleanup ifdefs.
(__cos): Likewise.
* sysdeps/ieee754/dbl-64/s_sin.c (__sincos): Refactor using the same
logic as sin and cos.
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_sin.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_sin.c | 29 |
1 files changed, 3 insertions, 26 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_sin.c b/sysdeps/ieee754/dbl-64/s_sin.c index 6e261f2..ba1dbe2 100644 --- a/sysdeps/ieee754/dbl-64/s_sin.c +++ b/sysdeps/ieee754/dbl-64/s_sin.c @@ -197,27 +197,17 @@ do_sincos (double a, double da, int4 n) /* An ultimate sin routine. Given an IEEE double machine number x */ /* it computes the correctly rounded (to nearest) value of sin(x) */ /*******************************************************************/ -#ifdef IN_SINCOS -static double -#else +#ifndef IN_SINCOS double SECTION -#endif __sin (double x) { -#ifndef IN_SINCOS double t, a, da; mynumber u; int4 k, m, n; double retval = 0; SET_RESTORE_ROUND_53BIT (FE_TONEAREST); -#else - double xx, t, cor; - mynumber u; - int4 k, m; - double retval = 0; -#endif u.x = x; m = u.i[HIGH_HALF]; @@ -242,7 +232,6 @@ __sin (double x) retval = __copysign (do_cos (t, hp1), x); } /* else if (k < 0x400368fd) */ -#ifndef IN_SINCOS /*-------------------------- 2.426265<|x|< 105414350 ----------------------*/ else if (k < 0x419921FB) { @@ -263,7 +252,6 @@ __sin (double x) __set_errno (EDOM); retval = x / x; } -#endif return retval; } @@ -274,27 +262,17 @@ __sin (double x) /* it computes the correctly rounded (to nearest) value of cos(x) */ /*******************************************************************/ -#ifdef IN_SINCOS -static double -#else double SECTION -#endif __cos (double x) { double y, a, da; mynumber u; -#ifndef IN_SINCOS int4 k, m, n; -#else - int4 k, m; -#endif double retval = 0; -#ifndef IN_SINCOS SET_RESTORE_ROUND_53BIT (FE_TONEAREST); -#endif u.x = x; m = u.i[HIGH_HALF]; @@ -320,8 +298,6 @@ __cos (double x) retval = do_sin (a, da); } /* else if (k < 0x400368fd) */ - -#ifndef IN_SINCOS else if (k < 0x419921FB) { /* 2.426265<|x|< 105414350 */ n = reduce_sincos (x, &a, &da); @@ -341,7 +317,6 @@ __cos (double x) __set_errno (EDOM); retval = x / x; /* |x| > 2^1024 */ } -#endif return retval; } @@ -352,3 +327,5 @@ libm_alias_double (__cos, cos) #ifndef __sin libm_alias_double (__sin, sin) #endif + +#endif |