On 5/29/20 7:12 AM, Adhemerval Zanella wrote:
>
>
> On 22/04/2020 22:41, Vineet Gupta via Libc-alpha wrote:
>> Signed-off-by: Vineet Gupta <[email protected]>
>> diff --git a/sysdeps/arc/fpu/e_sqrt.c b/sysdeps/arc/fpu/e_sqrt.c
>> +
>> +#include <math_private.h>
>> +#include <libm-alias-finite.h>
>> +
>> +double
>> +__ieee754_sqrt (double d)
>> +{
>> + return __builtin_sqrt (d);
>> +}
>> +libm_alias_finite (__ieee754_sqrt, __sqrt)
>
> I think it is better to extend to math-use-builtins.h for cover
> e_sqrt{f} so we can also adapt to other architecutes.
Good idea.
Side question: what do s_ / e_ prefixes mean?
The suffix is clear s_roundf (float), s_round (double), s_roundl (128).
>> diff --git a/sysdeps/arc/fpu/e_sqrtf.c b/sysdeps/arc/fpu/e_sqrtf.c
>> new file mode 100644
>> index 000000000000..13008a4f45d6
>> --- /dev/null
>> +++ b/sysdeps/arc/fpu/e_sqrtf.c
>> +#include <math_private.h>
>> +#include <libm-alias-finite.h>
>> +
>> +float
>> +__ieee754_sqrtf (float s)
>> +{
>> + return __builtin_sqrtf (s);
>> +}
>> +libm_alias_finite (__ieee754_sqrtf, __sqrtf)
>
> Same as before.
OK.
>> diff --git a/sysdeps/arc/fpu/s_fma.c b/sysdeps/arc/fpu/s_fma.c
>> +
>> +#include <math.h>
>> +#include <libm-alias-double.h>
>> +
>> +double
>> +__fma (double x, double y, double z)
>> +{
>> + return __builtin_fma (x, y, z);
>> +}
>> +
>> +libm_alias_double (__fma, fma)
>
> Same as for sqrt{f}.
OK.
>> diff --git a/sysdeps/arc/fpu/s_fmaf.c b/sysdeps/arc/fpu/s_fmaf.c
>> new file mode 100644
>> index 000000000000..544f32e27aec
>> --- /dev/null
>> +++ b/sysdeps/arc/fpu/s_fmaf.c
>> @@ -0,0 +1,28 @@
>> +/* Copyright (C) 2011-2020 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 <math.h>
>> +#include <libm-alias-float.h>
>> +
>> +float
>> +__fmaf (float x, float y, float z)
>> +{
>> + return __builtin_fmaf (x, y, z);
>> +}
>> +
>> +libm_alias_float (__fma, fma)
>> diff --git a/sysdeps/arc/fpu_control.h b/sysdeps/arc/fpu_control.h
>> new file mode 100644
>> index 000000000000..121656ff7d8c
>> --- /dev/null
>> +++ b/sysdeps/arc/fpu_control.h
>> @@ -0,0 +1,106 @@
>> +/* FPU control word bits. ARC version.
>> + Copyright (C) 2018-2020 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/>. */
>> +
>> +#ifndef _FPU_CONTROL_H
>> +#define _FPU_CONTROL_H
>> +
>> +/* ARC FPU control register bits.
>> +
>> + [ 0] -> IVE: Enable invalid operation exception.
>> + if 0, soft exception: status register IV flag set.
>> + if 1, hardware exception trap (not supported in Linux yet).
>> + [ 1] -> DZE: Enable division by zero exception.
>> + if 0, soft exception: status register IV flag set.
>> + if 1, hardware exception: (not supported in Linux yet).
>> + [9:8] -> RM: Rounding Mode:
>> + 00 - Rounding toward zero.
>> + 01 - Rounding to nearest (default).
>> + 10 - Rounding (up) toward plus infinity.
>> + 11 - Rounding (down)toward minus infinity.
>> +
>> + ARC FPU status register bits.
>> +
>> + [ 0] -> IV: flag invalid operation.
>> + [ 1] -> DZ: flag division by zero.
>> + [ 2] -> OV: flag Overflow operation.
>> + [ 3] -> UV: flag Underflow operation.
>> + [ 4] -> IX: flag Inexact operation.
>> + [31] -> FWE: Flag Write Enable.
>> + If 1, above flags writable explicitly (clearing),
>> + else IoW and only writable indirectly via bits [12:7]. */
>> +
>> +#include <features.h>
>> +
>> +#if !defined(__ARC_FPU_SP__) && !defined(__ARC_FPU_DP__)
>> +
>> +# define _FPU_RESERVED 0xffffffff
>> +# define _FPU_DEFAULT 0x00000000
>> +typedef unsigned int fpu_control_t;
>> +# define _FPU_GETCW(cw) (cw) = 0
>> +# define _FPU_SETCW(cw) (void) (cw)
>> +# define _FPU_GETS(cw) (cw) = 0
>> +# define _FPU_SETS(cw) (void) (cw)
>> +extern fpu_control_t __fpu_control;
>> +
>> +#else
>> +
>> +#define _FPU_RESERVED 0
>> +
>> +/* The fdlibm code requires strict IEEE double precision arithmetic,
>> + and no interrupts for exceptions, rounding to nearest.
>> + So only RM set to b'01. */
>> +# define _FPU_DEFAULT 0x00000100
>> +
>> +/* Actually default needs to have FWE bit as 1 but that is already
>> + ingrained into _FPU_SETS macro below. */
>> +#define _FPU_FPSR_DEFAULT 0x00000000
>> +
>> +#define __FPU_RND_SHIFT 8
>> +#define __FPU_RND_MASK 0x3
>> +
>> +/* Type of the control word. */
>> +typedef unsigned int fpu_control_t;
>> +
>> +/* Macros for accessing the hardware control word. */
>> +# define _FPU_GETCW(cw) __asm__ volatile ("lr %0, [0x300]" : "=r" (cw))
>> +# define _FPU_SETCW(cw) __asm__ volatile ("sr %0, [0x300]" : : "r" (cw))
>> +
>> +/* Macros for accessing the hardware status word.
>> + FWE bit is special as it controls if actual status bits could be
>> wrritten
>> + explicitly (other than FPU instructions). We handle it here to keep the
>> + callers agnostic of it:
>> + - clear it out when reporting status bits
>> + - always set it when changing status bits. */
>> +# define _FPU_GETS(cw) \
>> + __asm__ volatile ("lr %0, [0x301] \r\n" \
>> + "bclr %0, %0, 31 \r\n" \
>> + : "=r" (cw))
>> +
>> +# define _FPU_SETS(cw) \
>> + do { \
>> + unsigned int __tmp = 0x80000000 | (cw); \
>> + __asm__ volatile ("sr %0, [0x301] \r\n" \
>> + : : "r" (__tmp)); \
>> + } while (0)
>> +
>
> Although this code follow other architectures, I think it woudl be better
> to move forward a macro that emulates function calls and use proper
> static inline function instead for _FPU_* (as for get-rounding-mode.h).
OK. do you have a preference for names, existing upper case names OK ?
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