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math: Add long double constant definitions

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These constants are GNU libc extensions that are likely to be adopted
by the next POSIX revision [1]. The definitions can be verified in
a PARI-GP shell session:

* M_El: exp (1)
* M_LOG2El: log (exp (1)) / log (2)
* M_LOG10El: log (exp (1)) / log (10)
* M_LN2l: log (2)
* M_LN10l: log (10)
* M_PIl: Pi
* M_PI_2l: Pi / 2
* M_PI_4l: Pi / 4
* M_1_PIl: 1 / Pi
* M_2_PIl: 2 / Pi
* M_2_SQRTPIl: 2 / sqrt (Pi)
* M_SQRT2l: sqrt (2)
* M_SQRT1_2l: 1 / sqrt (2)

[1] https://austingroupbugs.net/view.php?id=828

Put these behind __BSD_VISIBLE || __XSI_VISIBLE >= 800 to future-proof
these changes. They shouldn't be defined at lower levels of XSI, but don't
have other XSI 800 stuff in place yet.

Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Reviewed by: imp, allanjude
Pull Request: https://github.com/freebsd/freebsd-src/pull/1121
This commit is contained in:
Collin Funk
2024-04-12 11:12:59 -06:00
committed by Warner Losh
parent 6c3e01bf85
commit 22ddb5bb83
1 changed files with 16 additions and 0 deletions
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lib/msun/src/math.h
+16
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@@ -142,6 +142,22 @@ typedef __float_t float_t;
#define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
#define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */
#if __BSD_VISIBLE || __XSI_VISIBLE >= 800
#define M_El 2.718281828459045235360287471352662498L /* e */
#define M_LOG2El 1.442695040888963407359924681001892137L /* log_2 e */
#define M_LOG10El 0.434294481903251827651128918916605082L /* log_10 e */
#define M_LN2l 0.693147180559945309417232121458176568L /* log_e 2 */
#define M_LN10l 2.302585092994045684017991454684364208L /* log_e 10 */
#define M_PIl 3.141592653589793238462643383279502884L /* pi */
#define M_PI_2l 1.570796326794896619231321691639751442L /* pi/2 */
#define M_PI_4l 0.785398163397448309615660845819875721L /* pi/4 */
#define M_1_PIl 0.318309886183790671537767526745028724L /* 1/pi */
#define M_2_PIl 0.636619772367581343075535053490057448L /* 2/pi */
#define M_2_SQRTPIl 1.128379167095512573896158903121545172L /* 2/sqrt(pi) */
#define M_SQRT2l 1.414213562373095048801688724209698079L /* sqrt(2) */
#define M_SQRT1_2l 0.707106781186547524400844362104849039L /* 1/sqrt(2) */
#endif /* __BSD_VISIBLE || __XSI_VISIBLE >= 800 */
#define MAXFLOAT ((float)3.40282346638528860e+38)
extern int signgam;
#endif /* __BSD_VISIBLE || __XSI_VISIBLE */