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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
| commit | 0ac5ae2335292908f39031b1ea9fe8edce433c0f (patch) | |
| tree | f9d26c8abc0de39d18d4c13e70f6022cdc6b461f /sysdeps/ieee754/dbl-64/e_hypot.c | |
| parent | a843a204a3e8a0dd53584dad3668771abaec84ac (diff) | |
| download | glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.gz glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.xz glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.zip | |
Optimize libm
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
Diffstat (limited to 'sysdeps/ieee754/dbl-64/e_hypot.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_hypot.c | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_hypot.c b/sysdeps/ieee754/dbl-64/e_hypot.c index 76a77ec33a..a89ccaa35e 100644 --- a/sysdeps/ieee754/dbl-64/e_hypot.c +++ b/sysdeps/ieee754/dbl-64/e_hypot.c @@ -10,10 +10,6 @@ * ==================================================== */ -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: e_hypot.c,v 1.9 1995/05/12 04:57:27 jtc Exp $"; -#endif - /* __ieee754_hypot(x,y) * * Method : @@ -42,19 +38,15 @@ static char rcsid[] = "$NetBSD: e_hypot.c,v 1.9 1995/05/12 04:57:27 jtc Exp $"; * hypot(x,y) is NAN if x or y is NAN. * * Accuracy: - * hypot(x,y) returns sqrt(x^2+y^2) with error less - * than 1 ulps (units in the last place) + * hypot(x,y) returns sqrt(x^2+y^2) with error less + * than 1 ulps (units in the last place) */ #include "math.h" #include "math_private.h" -#ifdef __STDC__ - double __ieee754_hypot(double x, double y) -#else - double __ieee754_hypot(x,y) - double x, y; -#endif +double +__ieee754_hypot(double x, double y) { double a,b,t1,t2,y1,y2,w; int32_t j,k,ha,hb; @@ -68,7 +60,7 @@ static char rcsid[] = "$NetBSD: e_hypot.c,v 1.9 1995/05/12 04:57:27 jtc Exp $"; SET_HIGH_WORD(b,hb); /* b <- |b| */ if((ha-hb)>0x3c00000) {return a+b;} /* x/y > 2**60 */ k=0; - if(ha > 0x5f300000) { /* a>2**500 */ + if(__builtin_expect(ha > 0x5f300000, 0)) { /* a>2**500 */ if(ha >= 0x7ff00000) { /* Inf or NaN */ u_int32_t low; w = a+b; /* for sNaN */ @@ -83,9 +75,9 @@ static char rcsid[] = "$NetBSD: e_hypot.c,v 1.9 1995/05/12 04:57:27 jtc Exp $"; SET_HIGH_WORD(a,ha); SET_HIGH_WORD(b,hb); } - if(hb < 0x20b00000) { /* b < 2**-500 */ + if(__builtin_expect(hb < 0x20b00000, 0)) { /* b < 2**-500 */ if(hb <= 0x000fffff) { /* subnormal b or 0 */ - u_int32_t low; + u_int32_t low; GET_LOW_WORD(low,b); if((hb|low)==0) return a; t1=0; @@ -94,7 +86,7 @@ static char rcsid[] = "$NetBSD: e_hypot.c,v 1.9 1995/05/12 04:57:27 jtc Exp $"; a *= t1; k -= 1022; } else { /* scale a and b by 2^600 */ - ha += 0x25800000; /* a *= 2^600 */ + ha += 0x25800000; /* a *= 2^600 */ hb += 0x25800000; /* b *= 2^600 */ k -= 600; SET_HIGH_WORD(a,ha); @@ -126,3 +118,4 @@ static char rcsid[] = "$NetBSD: e_hypot.c,v 1.9 1995/05/12 04:57:27 jtc Exp $"; return t1*w; } else return w; } +strong_alias (__ieee754_hypot, __hypot_finite) |