diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/fpu/e_hypot.S')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/fpu/e_hypot.S | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/fpu/e_hypot.S b/REORG.TODO/sysdeps/i386/fpu/e_hypot.S new file mode 100644 index 0000000000..7403566fd7 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/fpu/e_hypot.S @@ -0,0 +1,75 @@ +/* Compute the hypothenuse of X and Y. + Copyright (C) 1998-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <i386-math-asm.h> + +DEFINE_DBL_MIN + +#ifdef PIC +# define MO(op) op##@GOTOFF(%edx) +#else +# define MO(op) op +#endif + + .text +ENTRY(__ieee754_hypot) +#ifdef PIC + LOAD_PIC_REG (dx) +#endif + fldl 4(%esp) // x + fxam + fnstsw + fldl 12(%esp) // y : x + movb %ah, %ch + fxam + fnstsw + movb %ah, %al + orb %ch, %ah + sahf + jc 1f + fmul %st(0) // y * y : x + fxch // x : y * y + fmul %st(0) // x * x : y * y + faddp // x * x + y * y + fsqrt + DBL_NARROW_EVAL_UFLOW_NONNEG +2: ret + + // We have to test whether any of the parameters is Inf. + // In this case the result is infinity. +1: andb $0x45, %al + cmpb $5, %al + je 3f // jump if y is Inf + andb $0x45, %ch + cmpb $5, %ch + jne 4f // jump if x is not Inf + fxch +3: fstp %st(1) + fabs + jmp 2b + +4: testb $1, %al + jnz 5f // y is NaN + fxch +5: fstp %st(1) + jmp 2b + +END(__ieee754_hypot) +strong_alias (__ieee754_hypot, __hypot_finite) |