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Most libm routines depend on the rounding mode and/or set exception

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flags, so they are not pure.  Remove the __pure2 annotation from them.
I believe that the following routines and their float and long double
counterparts are the only ones here that can be __pure2:

	copysign is* fabs finite fmax fmin fpclassify ilogb nan signbit

When gcc supports FENV_ACCESS, perhaps there will be a new annotation
that allows the other functions to be considered pure when FENV_ACCESS
is off.

Discussed with:	bde
This commit is contained in:
David Schultz 2005-01-15 02:55:10 +00:00
parent 37f6bb092b
commit b6e65225a6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=140274
1 changed files with 29 additions and 31 deletions
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60
lib/msun/src/math.h
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@ -195,11 +195,9 @@ struct exception {
#endif /* __BSD_VISIBLE */
/*
* Most of these functions have the side effect of setting errno, so they
* are not declared as __pure2. (XXX: this point needs to be revisited,
* since C99 doesn't require the mistake of setting errno, and we mostly
* don't set it anyway. In C99, pragmas and functions for changing the
* rounding mode affect the purity of these functions.)
* Most of these functions depend on the rounding mode and have the side
* effect of raising floating-point exceptions, so they are not declared
* as __pure2. In C99, FENV_ACCESS affects the purity of these functions.
*/
__BEGIN_DECLS
/*
@ -244,36 +242,36 @@ double pow(double, double);
double sqrt(double);
double ceil(double);
double fabs(double);
double fabs(double) __pure2;
double floor(double);
double fmod(double, double);
/*
* These functions are not in C90 so they can be "right". The ones that
* never set errno in lib/msun are declared as __pure2.
* These functions are not in C90.
*/
#if __BSD_VISIBLE || __ISO_C_VISIBLE >= 1999 || __XSI_VISIBLE
double acosh(double);
double asinh(double);
double atanh(double);
double cbrt(double) __pure2;
double cbrt(double);
double erf(double);
double erfc(double) __pure2;
double expm1(double) __pure2;
double erfc(double);
double expm1(double);
double hypot(double, double);
int ilogb(double);
/* Our ilogb raises no exceptions; we side with IEEE-754R and C99, not POSIX */
int ilogb(double) __pure2;
int (isinf)(double) __pure2;
int (isnan)(double) __pure2;
double lgamma(double);
long long llrint(double);
long long llround(double);
double log1p(double) __pure2;
double logb(double) __pure2;
double log1p(double);
double logb(double);
long lrint(double);
long lround(double);
double nextafter(double, double);
double remainder(double, double);
double rint(double) __pure2;
double rint(double);
#endif /* __BSD_VISIBLE || __ISO_C_VISIBLE >= 1999 || __XSI_VISIBLE */
#if __BSD_VISIBLE || __XSI_VISIBLE
@ -295,7 +293,7 @@ double copysign(double, double) __pure2;
double fdim(double, double);
double fmax(double, double) __pure2;
double fmin(double, double) __pure2;
double nearbyint(double) __pure2;
double nearbyint(double);
double round(double);
double scalbln(double, long);
double scalbn(double, int);
@ -343,12 +341,12 @@ float sinhf(float);
float tanhf(float);
float expf(float);
float expm1f(float) __pure2;
float expm1f(float);
float frexpf(float, int *); /* fundamentally !__pure2 */
int ilogbf(float);
int ilogbf(float) __pure2;
float ldexpf(float, int);
float log10f(float);
float log1pf(float) __pure2;
float log1pf(float);
float logf(float);
float modff(float, float *); /* fundamentally !__pure2 */
@ -356,27 +354,27 @@ float powf(float, float);
float sqrtf(float);
float ceilf(float);
float fabsf(float);
float fabsf(float) __pure2;
float floorf(float);
float fmodf(float, float);
float roundf(float);
float erff(float);
float erfcf(float) __pure2;
float hypotf(float, float) __pure2;
float erfcf(float);
float hypotf(float, float);
float lgammaf(float);
float acoshf(float);
float asinhf(float);
float atanhf(float);
float cbrtf(float) __pure2;
float logbf(float) __pure2;
float cbrtf(float);
float logbf(float);
float copysignf(float, float) __pure2;
long long llrintf(float);
long long llroundf(float);
long lrintf(float);
long lroundf(float);
float nearbyintf(float) __pure2;
float nearbyintf(float);
float nextafterf(float, float);
float remainderf(float, float);
float rintf(float);
@ -433,7 +431,7 @@ long double atanl(long double);
long double cbrtl(long double);
#endif
long double ceill(long double);
long double copysignl(long double, long double);
long double copysignl(long double, long double) __pure2;
#if 0
long double coshl(long double);
long double cosl(long double);
@ -443,7 +441,7 @@ long double exp2l(long double);
long double expl(long double);
long double expm1l(long double);
#endif
long double fabsl(long double);
long double fabsl(long double) __pure2;
long double fdiml(long double, long double);
long double floorl(long double);
#if 0
@ -453,10 +451,10 @@ long double fmaxl(long double, long double) __pure2;
long double fminl(long double, long double) __pure2;
#if 0
long double fmodl(long double, long double);
long double frexpl(long double value, int *);
long double frexpl(long double value, int *); /* fundamentally !__pure2 */
long double hypotl(long double, long double);
#endif
int ilogbl(long double);
int ilogbl(long double) __pure2;
#if 0
long double ldexpl(long double, int);
long double lgammal(long double);
@ -469,8 +467,8 @@ long double logbl(long double);
long double logl(long double);
long lrintl(long double);
long lroundl(long double);
long double modfl(long double, long double *);
long double nanl(const char *);
long double modfl(long double, long double *); /* fundamentally !__pure2 */
long double nanl(const char *) __pure2;
long double nearbyintl(long double);
long double nextafterl(long double, long double);
double nexttoward(double, long double);