svn commit: r365922 - head/lib/msun/src

[Stefan Eßer]

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));
 }