File: | src/lib/libm/src/e_hypotf.c |
Warning: | line 76, column 6 The result of the left shift is undefined because the left operand is negative |
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1 | /* e_hypotf.c -- float version of e_hypot.c. | |||
2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. | |||
3 | */ | |||
4 | ||||
5 | /* | |||
6 | * ==================================================== | |||
7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |||
8 | * | |||
9 | * Developed at SunPro, a Sun Microsystems, Inc. business. | |||
10 | * Permission to use, copy, modify, and distribute this | |||
11 | * software is freely granted, provided that this notice | |||
12 | * is preserved. | |||
13 | * ==================================================== | |||
14 | */ | |||
15 | ||||
16 | #include "math.h" | |||
17 | #include "math_private.h" | |||
18 | ||||
19 | float | |||
20 | hypotf(float x, float y) | |||
21 | { | |||
22 | float a=x,b=y,t1,t2,yy1,y2,w; | |||
23 | int32_t j,k,ha,hb; | |||
24 | ||||
25 | GET_FLOAT_WORD(ha,x)do { ieee_float_shape_type gf_u; gf_u.value = (x); (ha) = gf_u .word; } while (0); | |||
| ||||
26 | ha &= 0x7fffffff; | |||
27 | GET_FLOAT_WORD(hb,y)do { ieee_float_shape_type gf_u; gf_u.value = (y); (hb) = gf_u .word; } while (0); | |||
28 | hb &= 0x7fffffff; | |||
29 | if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;} | |||
30 | SET_FLOAT_WORD(a,ha)do { ieee_float_shape_type sf_u; sf_u.word = (ha); (a) = sf_u .value; } while (0); /* a <- |a| */ | |||
31 | SET_FLOAT_WORD(b,hb)do { ieee_float_shape_type sf_u; sf_u.word = (hb); (b) = sf_u .value; } while (0); /* b <- |b| */ | |||
32 | if((ha-hb)>0xf000000) {return a+b;} /* x/y > 2**30 */ | |||
33 | k=0; | |||
34 | if(ha > 0x58800000) { /* a>2**50 */ | |||
35 | if(ha >= 0x7f800000) { /* Inf or NaN */ | |||
36 | w = a+b; /* for sNaN */ | |||
37 | if(ha == 0x7f800000) w = a; | |||
38 | if(hb == 0x7f800000) w = b; | |||
39 | return w; | |||
40 | } | |||
41 | /* scale a and b by 2**-68 */ | |||
42 | ha -= 0x22000000; hb -= 0x22000000; k += 68; | |||
43 | SET_FLOAT_WORD(a,ha)do { ieee_float_shape_type sf_u; sf_u.word = (ha); (a) = sf_u .value; } while (0); | |||
44 | SET_FLOAT_WORD(b,hb)do { ieee_float_shape_type sf_u; sf_u.word = (hb); (b) = sf_u .value; } while (0); | |||
45 | } | |||
46 | if(hb < 0x26800000) { /* b < 2**-50 */ | |||
47 | if(hb <= 0x007fffff) { /* subnormal b or 0 */ | |||
48 | if(hb==0) return a; | |||
49 | SET_FLOAT_WORD(t1,0x7e800000)do { ieee_float_shape_type sf_u; sf_u.word = (0x7e800000); (t1 ) = sf_u.value; } while (0); /* t1=2^126 */ | |||
50 | b *= t1; | |||
51 | a *= t1; | |||
52 | k -= 126; | |||
53 | } else { /* scale a and b by 2^68 */ | |||
54 | ha += 0x22000000; /* a *= 2^68 */ | |||
55 | hb += 0x22000000; /* b *= 2^68 */ | |||
56 | k -= 68; | |||
57 | SET_FLOAT_WORD(a,ha)do { ieee_float_shape_type sf_u; sf_u.word = (ha); (a) = sf_u .value; } while (0); | |||
58 | SET_FLOAT_WORD(b,hb)do { ieee_float_shape_type sf_u; sf_u.word = (hb); (b) = sf_u .value; } while (0); | |||
59 | } | |||
60 | } | |||
61 | /* medium size a and b */ | |||
62 | w = a-b; | |||
63 | if (w>b) { | |||
64 | SET_FLOAT_WORD(t1,ha&0xfffff000)do { ieee_float_shape_type sf_u; sf_u.word = (ha&0xfffff000 ); (t1) = sf_u.value; } while (0); | |||
65 | t2 = a-t1; | |||
66 | w = sqrtf(t1*t1-(b*(-b)-t2*(a+t1))); | |||
67 | } else { | |||
68 | a = a+a; | |||
69 | SET_FLOAT_WORD(yy1,hb&0xfffff000)do { ieee_float_shape_type sf_u; sf_u.word = (hb&0xfffff000 ); (yy1) = sf_u.value; } while (0); | |||
70 | y2 = b - yy1; | |||
71 | SET_FLOAT_WORD(t1,ha+0x00800000)do { ieee_float_shape_type sf_u; sf_u.word = (ha+0x00800000); (t1) = sf_u.value; } while (0); | |||
72 | t2 = a - t1; | |||
73 | w = sqrtf(t1*yy1-(w*(-w)-(t1*y2+t2*b))); | |||
74 | } | |||
75 | if(k
| |||
76 | SET_FLOAT_WORD(t1,0x3f800000+(k<<23))do { ieee_float_shape_type sf_u; sf_u.word = (0x3f800000+(k<< 23)); (t1) = sf_u.value; } while (0); | |||
| ||||
77 | return t1*w; | |||
78 | } else return w; | |||
79 | } | |||
80 | DEF_STD(hypotf)__asm__(".global " "hypotf" " ; " "hypotf" " = " "_libm_hypotf" ); |