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-rw-r--r--libquadmath/math/fmodq.c196
1 files changed, 98 insertions, 98 deletions
diff --git a/libquadmath/math/fmodq.c b/libquadmath/math/fmodq.c
index 55eb18ffb0a..4b1c476d68b 100644
--- a/libquadmath/math/fmodq.c
+++ b/libquadmath/math/fmodq.c
@@ -1,18 +1,18 @@
-/* fmodq.c -- __float128 version of e_fmod.c.
+/* e_fmodl.c -- long double version of e_fmod.c.
* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
*/
/*
* ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ * Copyright (C) 1993, 2011 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
+ * software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
-/*
+/*
* fmodq(x,y)
* Return x mod y in exact arithmetic
* Method: shift and subtract
@@ -25,105 +25,105 @@ static const __float128 one = 1.0, Zero[] = {0.0, -0.0,};
__float128
fmodq (__float128 x, __float128 y)
{
- int64_t n,hx,hy,hz,ix,iy,sx,i;
- uint64_t lx,ly,lz;
+ int64_t n,hx,hy,hz,ix,iy,sx,i;
+ uint64_t lx,ly,lz;
- GET_FLT128_WORDS64(hx,lx,x);
- GET_FLT128_WORDS64(hy,ly,y);
- sx = hx&0x8000000000000000ULL; /* sign of x */
- hx ^=sx; /* |x| */
- hy &= 0x7fffffffffffffffLL; /* |y| */
+ GET_FLT128_WORDS64(hx,lx,x);
+ GET_FLT128_WORDS64(hy,ly,y);
+ sx = hx&0x8000000000000000ULL; /* sign of x */
+ hx ^=sx; /* |x| */
+ hy &= 0x7fffffffffffffffLL; /* |y| */
- /* purge off exception values */
- if((hy|ly)==0||(hx>=0x7fff000000000000LL)|| /* y=0,or x not finite */
- ((hy|((ly|-ly)>>63))>0x7fff000000000000LL)) /* or y is NaN */
- return (x*y)/(x*y);
- if(hx<=hy) {
- if((hx<hy)||(lx<ly)) return x; /* |x|<|y| return x */
- if(lx==ly)
- return Zero[(uint64_t)sx>>63]; /* |x|=|y| return x*0*/
- }
+ /* purge off exception values */
+ if((hy|ly)==0||(hx>=0x7fff000000000000LL)|| /* y=0,or x not finite */
+ ((hy|((ly|-ly)>>63))>0x7fff000000000000LL)) /* or y is NaN */
+ return (x*y)/(x*y);
+ if(hx<=hy) {
+ if((hx<hy)||(lx<ly)) return x; /* |x|<|y| return x */
+ if(lx==ly)
+ return Zero[(uint64_t)sx>>63]; /* |x|=|y| return x*0*/
+ }
- /* determine ix = ilogb(x) */
- if(hx<0x0001000000000000LL) { /* subnormal x */
- if(hx==0) {
- for (ix = -16431, i=lx; i>0; i<<=1) ix -=1;
- } else {
- for (ix = -16382, i=hx<<15; i>0; i<<=1) ix -=1;
- }
- } else ix = (hx>>48)-0x3fff;
+ /* determine ix = ilogb(x) */
+ if(hx<0x0001000000000000LL) { /* subnormal x */
+ if(hx==0) {
+ for (ix = -16431, i=lx; i>0; i<<=1) ix -=1;
+ } else {
+ for (ix = -16382, i=hx<<15; i>0; i<<=1) ix -=1;
+ }
+ } else ix = (hx>>48)-0x3fff;
- /* determine iy = ilogb(y) */
- if(hy<0x0001000000000000LL) { /* subnormal y */
- if(hy==0) {
- for (iy = -16431, i=ly; i>0; i<<=1) iy -=1;
- } else {
- for (iy = -16382, i=hy<<15; i>0; i<<=1) iy -=1;
- }
- } else iy = (hy>>48)-0x3fff;
+ /* determine iy = ilogb(y) */
+ if(hy<0x0001000000000000LL) { /* subnormal y */
+ if(hy==0) {
+ for (iy = -16431, i=ly; i>0; i<<=1) iy -=1;
+ } else {
+ for (iy = -16382, i=hy<<15; i>0; i<<=1) iy -=1;
+ }
+ } else iy = (hy>>48)-0x3fff;
- /* set up {hx,lx}, {hy,ly} and align y to x */
- if(ix >= -16382)
- hx = 0x0001000000000000LL|(0x0000ffffffffffffLL&hx);
- else { /* subnormal x, shift x to normal */
- n = -16382-ix;
- if(n<=63) {
- hx = (hx<<n)|(lx>>(64-n));
- lx <<= n;
- } else {
- hx = lx<<(n-64);
- lx = 0;
- }
- }
- if(iy >= -16382)
- hy = 0x0001000000000000LL|(0x0000ffffffffffffLL&hy);
- else { /* subnormal y, shift y to normal */
- n = -16382-iy;
- if(n<=63) {
- hy = (hy<<n)|(ly>>(64-n));
- ly <<= n;
- } else {
- hy = ly<<(n-64);
- ly = 0;
- }
- }
+ /* set up {hx,lx}, {hy,ly} and align y to x */
+ if(ix >= -16382)
+ hx = 0x0001000000000000LL|(0x0000ffffffffffffLL&hx);
+ else { /* subnormal x, shift x to normal */
+ n = -16382-ix;
+ if(n<=63) {
+ hx = (hx<<n)|(lx>>(64-n));
+ lx <<= n;
+ } else {
+ hx = lx<<(n-64);
+ lx = 0;
+ }
+ }
+ if(iy >= -16382)
+ hy = 0x0001000000000000LL|(0x0000ffffffffffffLL&hy);
+ else { /* subnormal y, shift y to normal */
+ n = -16382-iy;
+ if(n<=63) {
+ hy = (hy<<n)|(ly>>(64-n));
+ ly <<= n;
+ } else {
+ hy = ly<<(n-64);
+ ly = 0;
+ }
+ }
- /* fix point fmod */
- n = ix - iy;
- while(n--) {
- hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1;
- if(hz<0){hx = hx+hx+(lx>>63); lx = lx+lx;}
- else {
- if((hz|lz)==0) /* return sign(x)*0 */
- return Zero[(uint64_t)sx>>63];
- hx = hz+hz+(lz>>63); lx = lz+lz;
- }
- }
- hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1;
- if(hz>=0) {hx=hz;lx=lz;}
+ /* fix point fmod */
+ n = ix - iy;
+ while(n--) {
+ hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1;
+ if(hz<0){hx = hx+hx+(lx>>63); lx = lx+lx;}
+ else {
+ if((hz|lz)==0) /* return sign(x)*0 */
+ return Zero[(uint64_t)sx>>63];
+ hx = hz+hz+(lz>>63); lx = lz+lz;
+ }
+ }
+ hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1;
+ if(hz>=0) {hx=hz;lx=lz;}
- /* convert back to floating value and restore the sign */
- if((hx|lx)==0) /* return sign(x)*0 */
- return Zero[(uint64_t)sx>>63];
- while(hx<0x0001000000000000LL) { /* normalize x */
- hx = hx+hx+(lx>>63); lx = lx+lx;
- iy -= 1;
- }
- if(iy>= -16382) { /* normalize output */
- hx = ((hx-0x0001000000000000LL)|((iy+16383)<<48));
- SET_FLT128_WORDS64(x,hx|sx,lx);
- } else { /* subnormal output */
- n = -16382 - iy;
- if(n<=48) {
- lx = (lx>>n)|((uint64_t)hx<<(64-n));
- hx >>= n;
- } else if (n<=63) {
- lx = (hx<<(64-n))|(lx>>n); hx = sx;
- } else {
- lx = hx>>(n-64); hx = sx;
- }
- SET_FLT128_WORDS64(x,hx|sx,lx);
- x *= one; /* create necessary signal */
- }
- return x; /* exact output */
+ /* convert back to floating value and restore the sign */
+ if((hx|lx)==0) /* return sign(x)*0 */
+ return Zero[(uint64_t)sx>>63];
+ while(hx<0x0001000000000000LL) { /* normalize x */
+ hx = hx+hx+(lx>>63); lx = lx+lx;
+ iy -= 1;
+ }
+ if(iy>= -16382) { /* normalize output */
+ hx = ((hx-0x0001000000000000LL)|((iy+16383)<<48));
+ SET_FLT128_WORDS64(x,hx|sx,lx);
+ } else { /* subnormal output */
+ n = -16382 - iy;
+ if(n<=48) {
+ lx = (lx>>n)|((uint64_t)hx<<(64-n));
+ hx >>= n;
+ } else if (n<=63) {
+ lx = (hx<<(64-n))|(lx>>n); hx = sx;
+ } else {
+ lx = hx>>(n-64); hx = sx;
+ }
+ SET_FLT128_WORDS64(x,hx|sx,lx);
+ x *= one; /* create necessary signal */
+ }
+ return x; /* exact output */
}
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