projects / thirdparty / glibc.git / blame
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| a92599ea | 1 | /* Compute the hypothenuse of X and Y. |
| 0ac5ae23 | 2 | Copyright (C) 1998, 2011 Free Software Foundation, Inc. |
| a92599ea UD |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
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10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 14 | Lesser General Public License for more details. |
| a92599ea | 15 | |
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16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, write to the Free | |
| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 19 | 02111-1307 USA. */ | |
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20 | |
| 21 | #include <sysdep.h> | |
| 22 | ||
| 23 | .text | |
| 24 | ENTRY(__ieee754_hypotf) | |
| 25 | flds 4(%esp) // x | |
| 26 | fxam | |
| 27 | fnstsw | |
| 28 | flds 8(%esp) // y : x | |
| 29 | movb %ah, %ch | |
| 30 | fxam | |
| 31 | fnstsw | |
| 32 | movb %ah, %al | |
| 33 | orb %ch, %ah | |
| 34 | sahf | |
| 35 | jc 1f | |
| 36 | fmul %st(0) // y * y : x | |
| 37 | fxch // x : y * y | |
| 38 | fmul %st(0) // x * x : y * y | |
| 39 | faddp // x * x + y * y | |
| 40 | fsqrt | |
| 41 | 2: ret | |
| 42 | ||
| 43 | // We have to test whether any of the parameters is Inf. | |
| 44 | // In this case the result is infinity. | |
| 45 | 1: andb $0x45, %al | |
| 46 | cmpb $5, %al | |
| 47 | je 3f // jump if y is Inf | |
| 48 | andb $0x45, %ch | |
| 49 | cmpb $5, %ch | |
| 50 | jne 4f // jump if x is not Inf | |
| 51 | fxch | |
| 52 | 3: fstp %st(1) | |
| 53 | fabs | |
| 54 | jmp 2b | |
| 55 | ||
| 56 | 4: testb $1, %al | |
| 57 | jnz 5f // y is NaN | |
| 58 | fxch | |
| 59 | 5: fstp %st(1) | |
| 60 | jmp 2b | |
| 0ac5ae23 | 61 | |
| a92599ea | 62 | END(__ieee754_hypotf) |
| 0ac5ae23 | 63 | strong_alias (__ieee754_hypotf, __hypotf_finite) |