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authorH.J. Lu <hjl.tools@gmail.com>2012-06-18 11:43:51 -0700
committerH.J. Lu <hjl.tools@gmail.com>2012-06-18 11:43:51 -0700
commita2f34833b1042d5d8eeb263b4cf4caaea138c4ad (patch)
treeb488842849a2e5c81dce044e856b6a08672223f2 /sysdeps/x86_64
parent3ee947b1244a4562e8934b98f39e17f98d2309da (diff)
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Use x86-64 fpu_control.h for i386 and x86_64
Diffstat (limited to 'sysdeps/x86_64')
-rw-r--r--sysdeps/x86_64/fpu_control.h109
1 files changed, 0 insertions, 109 deletions
diff --git a/sysdeps/x86_64/fpu_control.h b/sysdeps/x86_64/fpu_control.h
deleted file mode 100644
index 605302c09b..0000000000
--- a/sysdeps/x86_64/fpu_control.h
+++ /dev/null
@@ -1,109 +0,0 @@
-/* FPU control word bits. x86 version.
- Copyright (C) 1993-2012 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Olaf Flebbe.
-
- 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/>. */
-
-#ifndef _FPU_CONTROL_H
-#define _FPU_CONTROL_H 1
-
-/* Note that this file sets on x86-64 only the x87 FPU, it does not
- touch the SSE unit. */
-
-/* Here is the dirty part. Set up your 387 through the control word
- * (cw) register.
- *
- * 15-13 12 11-10 9-8 7-6 5 4 3 2 1 0
- * | reserved | IC | RC | PC | reserved | PM | UM | OM | ZM | DM | IM
- *
- * IM: Invalid operation mask
- * DM: Denormalized operand mask
- * ZM: Zero-divide mask
- * OM: Overflow mask
- * UM: Underflow mask
- * PM: Precision (inexact result) mask
- *
- * Mask bit is 1 means no interrupt.
- *
- * PC: Precision control
- * 11 - round to extended precision
- * 10 - round to double precision
- * 00 - round to single precision
- *
- * RC: Rounding control
- * 00 - rounding to nearest
- * 01 - rounding down (toward - infinity)
- * 10 - rounding up (toward + infinity)
- * 11 - rounding toward zero
- *
- * IC: Infinity control
- * That is for 8087 and 80287 only.
- *
- * The hardware default is 0x037f which we use.
- */
-
-#include <features.h>
-
-/* masking of interrupts */
-#define _FPU_MASK_IM 0x01
-#define _FPU_MASK_DM 0x02
-#define _FPU_MASK_ZM 0x04
-#define _FPU_MASK_OM 0x08
-#define _FPU_MASK_UM 0x10
-#define _FPU_MASK_PM 0x20
-
-/* precision control */
-#define _FPU_EXTENDED 0x300 /* libm requires double extended precision. */
-#define _FPU_DOUBLE 0x200
-#define _FPU_SINGLE 0x0
-
-/* rounding control */
-#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
-#define _FPU_RC_DOWN 0x400
-#define _FPU_RC_UP 0x800
-#define _FPU_RC_ZERO 0xC00
-
-#define _FPU_RESERVED 0xF0C0 /* Reserved bits in cw */
-
-
-/* The fdlibm code requires strict IEEE double precision arithmetic,
- and no interrupts for exceptions, rounding to nearest. */
-
-#define _FPU_DEFAULT 0x037f
-
-/* IEEE: same as above. */
-#define _FPU_IEEE 0x037f
-
-/* Type of the control word. */
-typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
-
-/* Macros for accessing the hardware control word. "*&" is used to
- work around a bug in older versions of GCC. __volatile__ is used
- to support combination of writing the control register and reading
- it back. Without __volatile__, the old value may be used for reading
- back under compiler optimization.
-
- Note that the use of these macros is not sufficient anymore with
- recent hardware nor on x86-64. Some floating point operations are
- executed in the SSE/SSE2 engines which have their own control and
- status register. */
-#define _FPU_GETCW(cw) __asm__ __volatile__ ("fnstcw %0" : "=m" (*&cw))
-#define _FPU_SETCW(cw) __asm__ __volatile__ ("fldcw %0" : : "m" (*&cw))
-
-/* Default control word set at startup. */
-extern fpu_control_t __fpu_control;
-
-#endif /* fpu_control.h */