From: "Gabriel F. T. Gomes" <gabriel@inconstante.eti.br>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Cc: <libc-alpha@sourceware.org>
Subject: Re: [PATCH 04/28] powerpc: ceil/ceilf refactor
Date: Wed, 24 Apr 2019 22:56:55 -0300 [thread overview]
Message-ID: <20190425015655.c2wckfwowa4xboc4@tereshkova> (raw)
In-Reply-To: <20190329133529.22523-5-adhemerval.zanella@linaro.org>
On Fri, Mar 29 2019, Adhemerval Zanella wrote:
>
> The IFUNC organization for powerpc64 is also change to be enabled only
> for powerpc64 and not for powerpc64le.
OK.
> * sysdeps/powerpc/fpu/fenv_libc.h (__fesetround_inline_nocheck): New
> macro.
I really wish we can get rid of the burden of writing changelogs, but
for now shouldn't this be function, instead of macro?
> +/* Same as __fesetround_inline, however without runtime check to use DFP
> + mtfsfi syntax or if round is valid. */
What would be a runtime check to use DFP syntax? Are you referring to
the optional third parameter (W) to mtfsfi? I don't see such mechanism
in __fesetround_inline, so I'm not sure I understand this
comment/comparison.
> +static inline void
> +__fesetround_inline_nocheck (const int round)
> +{
> + asm volatile ("mtfsfi 7,%0" : : "i" (round));
> +}
> +
The implementation looks OK.
> +enum round_mode
> +{
> + CEIL,
> + FLOOR,
> + ROUND,
> + TRUNC,
> + NEARBYINT,
> +};
OK. To be used in following patches.
> +static inline void
> +set_fenv_mode (enum round_mode mode)
> +{
> + int rmode;
> + switch (mode)
> + {
> + case CEIL: rmode = FE_UPWARD; break;
> + default: rmode = FE_TONEAREST; break;
> + }
> + __fesetround_inline_nocheck (rmode);
> +}
OK.
> +static inline float
> +round_to_integer_float (enum round_mode mode, float x)
> +{
> + /* Ensure sNaN input is converted to qNaN. */
> + if (__glibc_unlikely (isnan (x)))
> + return x + x;
> +
> + if (fabs (x) > 0x1p+23)
> + return x;
> +
> + float r = x;
> +
> + /* Save current FPU rounding mode and inexact state. */
> + fenv_t fe = fegetenv_register ();
> + set_fenv_mode (mode);
> + if (x > 0.0)
> + {
> + r += 0x1p+23;
> + r -= 0x1p+23;
> + r = fabs (r);
> + }
> + else if (x < 0.0)
> + {
> + r -= 0x1p+23;
> + r += 0x1p+23;
> + r = -fabs (r);
> + }
> + __builtin_mtfsf (0xff, fe);
> +
> + return r;
> +}
Ok.
> +static inline double
> +round_to_integer_double (enum round_mode mode, double x)
> +{
> + /* Ensure sNaN input is converted to qNaN. */
> + if (__glibc_unlikely (isnan (x)))
> + return x + x;
> +
> + if (fabs (x) > 0x1p+52)
> + return x;
> +
> + double r = x;
> +
> + /* Save current FPU rounding mode and inexact state. */
> + fenv_t fe = fegetenv_register ();
> + set_fenv_mode (mode);
> + if (x > 0.0)
> + {
> + r += 0x1p+52;
> + r -= 0x1p+52;
> + r = fabs (r);
> + }
> + else if (x < 0.0)
> + {
> + r -= 0x1p+52;
> + r += 0x1p+52;
> + r = -fabs (r);
> + }
> + __builtin_mtfsf (0xff, fe);
> +
> + return r;
> +}
OK.
> +double
> +__ceil (double x)
> +{
> +#ifdef _ARCH_PWR5X
> + return __builtin_ceil (x);
> +#else
> + return round_to_integer_double (CEIL, x);
> +#endif
The arch check looks correct.
next prev parent reply other threads:[~2019-04-25 1:57 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-29 13:35 [PATCH 00/28] powerpc floating-point optimization refactor Adhemerval Zanella
2019-03-29 13:35 ` [PATCH 01/28] powerpc: Use generic fabs{f} implementations Adhemerval Zanella
2019-04-01 20:04 ` Joseph Myers
2019-04-03 1:04 ` Adhemerval Zanella
2019-04-15 20:23 ` Gabriel F. T. Gomes
2019-04-15 21:32 ` Tulio Magno Quites Machado Filho
2019-04-17 17:08 ` Adhemerval Zanella
2019-03-29 13:35 ` [PATCH 02/28] powerpc: fma using builtins Adhemerval Zanella
2019-04-01 20:05 ` Joseph Myers
2019-04-03 1:06 ` Adhemerval Zanella
2019-04-15 21:44 ` Gabriel F. T. Gomes
2019-04-17 21:10 ` Joseph Myers
2019-04-17 21:28 ` Adhemerval Zanella
2019-03-29 13:35 ` [PATCH 03/28] powerpc: Remove power4 mpa optimization Adhemerval Zanella
2019-04-24 21:51 ` Gabriel F. T. Gomes
2019-04-25 12:19 ` Adhemerval Zanella
2019-03-29 13:35 ` [PATCH 04/28] powerpc: ceil/ceilf refactor Adhemerval Zanella
2019-04-25 1:56 ` Gabriel F. T. Gomes [this message]
2019-04-25 21:58 ` Adhemerval Zanella
2019-05-02 18:41 ` Gabriel F. T. Gomes
2019-05-04 21:46 ` Gabriel F. T. Gomes
2019-05-06 12:22 ` Adhemerval Zanella
2019-05-09 19:56 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 05/28] powerpc: floor/floorf refactor Adhemerval Zanella
2019-05-03 21:44 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 06/28] powerpc: round/roundf refactor Adhemerval Zanella
2019-05-04 1:10 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 07/28] powerpc: trunc/truncf refactor Adhemerval Zanella
2019-05-09 20:06 ` Gabriel F. T. Gomes
2019-05-09 20:54 ` Adhemerval Zanella
2019-05-09 21:36 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 08/28] powerpc: generic nearbyint/nearbyintf Adhemerval Zanella
2019-05-27 20:42 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 09/28] powerpc: consolidate rint Adhemerval Zanella
2019-05-30 14:36 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 10/28] powerpc: copysign cleanup Adhemerval Zanella
2019-05-31 14:14 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 11/28] benchtests: Add isnan/isinf/isfinite benchmark Adhemerval Zanella
2019-06-05 22:45 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 12/28] math: Use wordsize-64 version for isnan Adhemerval Zanella
2019-06-05 22:45 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 13/28] powerpc: Remove optimized isnan Adhemerval Zanella
2019-06-05 22:46 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 14/28] math: Use wordsize-64 version for isinf Adhemerval Zanella
2019-06-11 13:13 ` Gabriel F. T. Gomes
2019-06-13 8:57 ` Szabolcs Nagy
2019-06-13 9:11 ` Szabolcs Nagy
2019-03-29 13:35 ` [PATCH 15/28] powerpc: Remove optimized isinf Adhemerval Zanella
2019-06-11 13:45 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 16/28] math: Use wordsize-64 version for finite Adhemerval Zanella
2019-06-11 16:20 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 17/28] powerpc: Remove optimized finite Adhemerval Zanella
2019-06-11 18:08 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 18/28] powerpc: refactor powerpc64 lrint/lrintf/llrint/llrintf Adhemerval Zanella
2019-06-13 19:30 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 19/28] powerpc: Refactor powerpc32 lrint/lrintf/llrint/llrintf Adhemerval Zanella
2019-06-14 18:34 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 20/28] powerpc: Refactor powerpc64 lround/lroundf/llround/llroundf Adhemerval Zanella
2019-06-13 19:30 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 21/28] powerpc: Refactor powerpc32 lround/lroundf/llround/llroundf Adhemerval Zanella
2019-06-24 21:07 ` Gabriel F. T. Gomes
2019-06-25 18:34 ` Adhemerval Zanella
2019-06-25 18:44 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 22/28] powerpc: Use generic e_expf Adhemerval Zanella
2019-06-26 12:59 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 23/28] benchtests: hypot benchmark Adhemerval Zanella
2019-06-26 19:58 ` Gabriel F. T. Gomes
2019-03-29 13:35 ` [PATCH 24/28] powerpc: hypot refactor and optimization Adhemerval Zanella
2019-04-01 20:14 ` Joseph Myers
2019-04-03 1:08 ` Adhemerval Zanella
2019-06-26 19:59 ` Gabriel F. T. Gomes
2019-07-08 15:37 ` Adhemerval Zanella
2019-07-08 18:30 ` Adhemerval Zanella
2019-03-29 13:35 ` [PATCH 25/28] powerpc: Refactor modf{f} Adhemerval Zanella
2019-07-05 1:23 ` Gabriel F. T. Gomes
2019-07-08 18:30 ` Adhemerval Zanella
2019-03-29 13:35 ` [PATCH 26/28] benchtests: Add logb{f} benchmark Adhemerval Zanella
2019-07-05 1:23 ` Gabriel F. T. Gomes
2019-07-08 18:31 ` Adhemerval Zanella
2019-03-29 13:35 ` [PATCH 27/28] math: Use wordsize-64 version for s_logb Adhemerval Zanella
2019-07-05 1:23 ` Gabriel F. T. Gomes
2019-07-08 18:31 ` Adhemerval Zanella
2019-03-29 13:35 ` [PATCH 28/28] powerpc: refactor logb{f,l} Adhemerval Zanella
2019-07-05 1:24 ` Gabriel F. T. Gomes
2019-07-08 18:31 ` Adhemerval Zanella
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