Date: Sun, 20 Sep 2020 05:32:53 +0000 (UTC) From: =?UTF-8?Q?Stefan_E=c3=9fer?= <se@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r365922 - head/lib/msun/src Message-ID: <202009200532.08K5WrUZ007928@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: se Date: Sun Sep 20 05:32:53 2020 New Revision: 365922 URL: https://svnweb.freebsd.org/changeset/base/365922 Log: Apply an opimization for the kernels used by cexp(x) and cexpf(x) submitted by Steve Kargl: - Use sincos[f] instead of a call to cos[f] and a call to sin[f]. - While here, alphabetize declaration. Submitted by: sgk at troutmask.apl.washington.edu (Steve Kargl) Modified: head/lib/msun/src/k_exp.c head/lib/msun/src/k_expf.c Modified: head/lib/msun/src/k_exp.c ============================================================================== --- head/lib/msun/src/k_exp.c Sun Sep 20 05:28:31 2020 (r365921) +++ head/lib/msun/src/k_exp.c Sun Sep 20 05:32:53 2020 (r365922) @@ -88,7 +88,7 @@ __ldexp_exp(double x, int expt) double complex __ldexp_cexp(double complex z, int expt) { - double x, y, exp_x, scale1, scale2; + double c, exp_x, s, scale1, scale2, x, y; int ex_expt, half_expt; x = creal(z); @@ -105,6 +105,7 @@ __ldexp_cexp(double complex z, int expt) half_expt = expt - half_expt; INSERT_WORDS(scale2, (0x3ff + half_expt) << 20, 0); - return (CMPLX(cos(y) * exp_x * scale1 * scale2, - sin(y) * exp_x * scale1 * scale2)); + sincos(y, &s, &c); + return (CMPLX(c * exp_x * scale1 * scale2, + s * exp_x * scale1 * scale2)); } Modified: head/lib/msun/src/k_expf.c ============================================================================== --- head/lib/msun/src/k_expf.c Sun Sep 20 05:28:31 2020 (r365921) +++ head/lib/msun/src/k_expf.c Sun Sep 20 05:32:53 2020 (r365922) @@ -71,7 +71,7 @@ __ldexp_expf(float x, int expt) float complex __ldexp_cexpf(float complex z, int expt) { - float x, y, exp_x, scale1, scale2; + float c, exp_x, s, scale1, scale2, x, y; int ex_expt, half_expt; x = crealf(z); @@ -84,6 +84,7 @@ __ldexp_cexpf(float complex z, int expt) half_expt = expt - half_expt; SET_FLOAT_WORD(scale2, (0x7f + half_expt) << 23); - return (CMPLXF(cosf(y) * exp_x * scale1 * scale2, - sinf(y) * exp_x * scale1 * scale2)); + sincosf(y, &s, &c); + return (CMPLXF(c * exp_x * scale1 * scale2, + s * exp_x * scale1 * scale2)); }
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202009200532.08K5WrUZ007928>