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-rw-r--r--src/math/hypotf.c107
1 files changed, 28 insertions, 79 deletions
diff --git a/src/math/hypotf.c b/src/math/hypotf.c
index 4d80178d..2fc214b7 100644
--- a/src/math/hypotf.c
+++ b/src/math/hypotf.c
@@ -1,86 +1,35 @@
-/* origin: FreeBSD /usr/src/lib/msun/src/e_hypotf.c */
-/*
- * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
- */
-/*
- * ====================================================
- * Copyright (C) 1993 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
- * is preserved.
- * ====================================================
- */
-
-#include "libm.h"
+#include <math.h>
+#include <stdint.h>
float hypotf(float x, float y)
{
- float a,b,t1,t2,y1,y2,w;
- int32_t j,k,ha,hb;
+ union {float f; uint32_t i;} ux = {x}, uy = {y}, ut;
+ float_t z;
- GET_FLOAT_WORD(ha,x);
- ha &= 0x7fffffff;
- GET_FLOAT_WORD(hb,y);
- hb &= 0x7fffffff;
- if (hb > ha) {
- a = y;
- b = x;
- j=ha; ha=hb; hb=j;
- } else {
- a = x;
- b = y;
- }
- a = fabsf(a);
- b = fabsf(b);
- if (ha - hb > 0xf000000) /* x/y > 2**30 */
- return a+b;
- k = 0;
- if (ha > 0x58800000) { /* a > 2**50 */
- if(ha >= 0x7f800000) { /* Inf or NaN */
- /* Use original arg order iff result is NaN; quieten sNaNs. */
- w = fabsf(x+0.0f) - fabsf(y+0.0f);
- if (ha == 0x7f800000) w = a;
- if (hb == 0x7f800000) w = b;
- return w;
- }
- /* scale a and b by 2**-68 */
- ha -= 0x22000000; hb -= 0x22000000; k += 68;
- SET_FLOAT_WORD(a, ha);
- SET_FLOAT_WORD(b, hb);
- }
- if (hb < 0x26800000) { /* b < 2**-50 */
- if (hb <= 0x007fffff) { /* subnormal b or 0 */
- if (hb == 0)
- return a;
- SET_FLOAT_WORD(t1, 0x7e800000); /* t1 = 2^126 */
- b *= t1;
- a *= t1;
- k -= 126;
- } else { /* scale a and b by 2^68 */
- ha += 0x22000000; /* a *= 2^68 */
- hb += 0x22000000; /* b *= 2^68 */
- k -= 68;
- SET_FLOAT_WORD(a, ha);
- SET_FLOAT_WORD(b, hb);
- }
+ ux.i &= -1U>>1;
+ uy.i &= -1U>>1;
+ if (ux.i < uy.i) {
+ ut = ux;
+ ux = uy;
+ uy = ut;
}
- /* medium size a and b */
- w = a - b;
- if (w > b) {
- SET_FLOAT_WORD(t1, ha&0xfffff000);
- t2 = a - t1;
- w = sqrtf(t1*t1-(b*(-b)-t2*(a+t1)));
- } else {
- a = a + a;
- SET_FLOAT_WORD(y1, hb&0xfffff000);
- y2 = b - y1;
- SET_FLOAT_WORD(t1,(ha+0x00800000)&0xfffff000);
- t2 = a - t1;
- w = sqrtf(t1*y1-(w*(-w)-(t1*y2+t2*b)));
+
+ x = ux.f;
+ y = uy.f;
+ if (uy.i == 0xff<<23)
+ return y;
+ if (ux.i >= 0xff<<23 || uy.i == 0 || ux.i - uy.i >= 25<<23)
+ return x + y;
+
+ z = 1;
+ if (ux.i >= (0x7f+60)<<23) {
+ z = 0x1p90f;
+ x *= 0x1p-90f;
+ y *= 0x1p-90f;
+ } else if (uy.i < (0x7f-60)<<23) {
+ z = 0x1p-90f;
+ x *= 0x1p90f;
+ y *= 0x1p90f;
}
- if (k)
- w = scalbnf(w, k);
- return w;
+ return z*sqrtf((double)x*x + (double)y*y);
}