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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-04-06 12:32:06 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-12-13 09:08:02 -0300 |
| commit | a1d3c9b64266d84736ba8eac96aa864165905b79 (patch) | |
| tree | 8543d9053dc4865580466a1ec5b83560fd9ba42f /sysdeps/i386/fpu/e_hypot.S | |
| parent | c212d6397e05d0ce65405706ea0b427a418ce5ef (diff) | |
| download | glibc-a1d3c9b64266d84736ba8eac96aa864165905b79.tar.gz glibc-a1d3c9b64266d84736ba8eac96aa864165905b79.tar.xz glibc-a1d3c9b64266d84736ba8eac96aa864165905b79.zip | |
i386: Move hypot implementation to C
The generic hypotf is slight slower, mostly due the tricks the assembly does to optimize the isinf/isnan/issignaling. The generic hypot is way slower, since the optimized implementation uses the i386 default excessive precision to issue the operation directly. A similar implementation is provided instead of using the generic implementation: Checked on i686-linux-gnu.
Diffstat (limited to 'sysdeps/i386/fpu/e_hypot.S')
| -rw-r--r-- | sysdeps/i386/fpu/e_hypot.S | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/sysdeps/i386/fpu/e_hypot.S b/sysdeps/i386/fpu/e_hypot.S deleted file mode 100644 index f2c956b77a..0000000000 --- a/sysdeps/i386/fpu/e_hypot.S +++ /dev/null @@ -1,75 +0,0 @@ -/* Compute the hypothenuse of X and Y. - Copyright (C) 1998-2021 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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 - <https://www.gnu.org/licenses/>. */ - -#include <sysdep.h> -#include <i386-math-asm.h> -#include <libm-alias-finite.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) -libm_alias_finite (__ieee754_hypot, __hypot) |