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| author | Sandra Loosemore <sandra@codesourcery.com> | 2015-05-06 12:01:05 -0400 |
|---|---|---|
| committer | Sandra Loosemore <sandra@gcc.gnu.org> | 2015-05-06 12:01:05 -0400 |
| commit | 5a0ff57c48cbaeedfac667d5e808baca8dbcb83c (patch) | |
| tree | a9fc9cd0a5bcc2c76ff3803079fb8a0b0254fb94 /libgcc/config | |
| parent | 29e597d0e6c853b1487ee86357df704a5e0ab618 (diff) | |
| download | gcc-5a0ff57c48cbaeedfac667d5e808baca8dbcb83c.zip gcc-5a0ff57c48cbaeedfac667d5e808baca8dbcb83c.tar.gz gcc-5a0ff57c48cbaeedfac667d5e808baca8dbcb83c.tar.bz2 | |
unknown-elf.h (STARTFILE_SPEC): Add conditional linking of crtfastmath.o.
2015-05-06 Sandra Loosemore <sandra@codesourcery.com>
Chris Jones <chrisj@nvidia.com>
Joshua Conner <jconner@nvidia.com>
gcc/
* config/arm/unknown-elf.h (STARTFILE_SPEC): Add conditional
linking of crtfastmath.o.
* config/arm/linux-eabi.h (STARTFILE_SPEC): Likewise.
libgcc/
* config.host (arm*-*-linux*): Add support for crtfastmath.o.
(arm*-*-uclinux*): Likewise.
(arm*-*-eabi* | arm*-*-rtems*): Likewise.
* config/arm/crtfastmath.c: New file.
Co-Authored-By: Chris Jones <chrisj@nvidia.com>
Co-Authored-By: Joshua Conner <jconner@nvidia.com>
From-SVN: r222857
Diffstat (limited to 'libgcc/config')
| -rw-r--r-- | libgcc/config/arm/crtfastmath.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/libgcc/config/arm/crtfastmath.c b/libgcc/config/arm/crtfastmath.c new file mode 100644 index 0000000..9573514 --- /dev/null +++ b/libgcc/config/arm/crtfastmath.c @@ -0,0 +1,40 @@ +/* + * Copyright (C) 2014 Free Software Foundation, Inc. + * + * This file is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 3, or (at your option) any + * later version. + * + * This file 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 + * General Public License for more details. + * + * Under Section 7 of GPL version 3, you are granted additional + * permissions described in the GCC Runtime Library Exception, version + * 3.1, as published by the Free Software Foundation. + * + * You should have received a copy of the GNU General Public License and + * a copy of the GCC Runtime Library Exception along with this program; + * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + * <http://www.gnu.org/licenses/>. + */ + +/* Enable flush-to-zero support for -ffast-math on VFP targets. */ +#ifndef __SOFTFP__ + +#define FPSCR_FZ (1 << 24) + +static void __attribute__((constructor)) +__arm_set_fast_math (void) +{ + unsigned int fpscr_save; + + /* Set the FZ (flush-to-zero) bit in FPSCR. */ + __asm__("vmrs %0, fpscr" : "=r" (fpscr_save)); + fpscr_save |= FPSCR_FZ; + __asm__("vmsr fpscr, %0" : : "r" (fpscr_save)); +} + +#endif /* __SOFTFP__ */ |