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* sysdeps/mips/fpu/fraiseexcpt.c (__feraiseexcept): Set cause bits.

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* sysdeps/mips/fpu/fgetexcptflg.c (__fegetexceptflag): Add comment.

	* sysdeps/mips/fpu/fclrexcpt.c (__feclearexcept): Clear also cause
	bits.

	* sysdeps/mips/fpu/fenv_libc.h (CAUSE_MASK): New.
	(CAUSE_SHIFT): New.
This commit is contained in:
Andreas Jaeger 2002-03-17 12:06:59 +00:00
parent 5154198c0e
commit ced0a621eb
4 changed files with 30 additions and 12 deletions
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11
sysdeps/mips/fpu/fclrexcpt.c
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@ -1,5 +1,5 @@
/* Clear given exceptions in current floating-point environment.
Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1998.
@ -19,6 +19,7 @@
02111-1307 USA. */
#include <fenv.h>
#include <fenv_libc.h>
#include <fpu_control.h>
#include <shlib-compat.h>
@ -33,8 +34,11 @@ __feclearexcept (int excepts)
/* Read the complete control word. */
_FPU_GETCW (cw);
/* Clear exception bits. */
cw &= ~excepts;
/* Clear exception flag bits and cause bits. If the cause bit is not
cleared, the next CTC instruction (just below) will re-generate
the exception. */
cw &= ~(excepts | (excepts << CAUSE_SHIFT));
/* Put the new data in effect. */
_FPU_SETCW (cw);
@ -42,6 +46,7 @@ __feclearexcept (int excepts)
/* Success. */
return 0;
}
#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
strong_alias (__feclearexcept, __old_feclearexcept)
compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);

11
sysdeps/mips/fpu/fenv_libc.h
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@ -1,4 +1,4 @@
/* Copyright (C) 2000 Free Software Foundation, Inc.
/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>.
@ -20,10 +20,13 @@
#ifndef _FENV_LIBC_H
#define _FENV_LIBC_H 1
/* Mask for enabling exceptions. */
#define ENABLE_MASK 0xF80U
/* Mask for enabling exceptions and for the CAUSE bits. */
#define ENABLE_MASK 0x00F80U
#define CAUSE_MASK 0x1F000U
/* Shift for FE_* flags. */
/* Shift for FE_* flags to get up to the ENABLE bits and the CAUSE bits. */
#define ENABLE_SHIFT 5
#define CAUSE_SHIFT 10
#endif /* _FENV_LIBC_H */

6
sysdeps/mips/fpu/fgetexcptflg.c
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@ -1,5 +1,5 @@
/* Store current representation for exceptions.
Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1998.
@ -30,6 +30,10 @@ __fegetexceptflag (fexcept_t *flagp, int excepts)
/* Get the current exceptions. */
_FPU_GETCW (temp);
/* It is important that the CAUSE bits are not saved here. If they
were, a call to fesetexceptflag() would generate an
exception. */
*flagp = temp & excepts & FE_ALL_EXCEPT;
/* Success. */

12
sysdeps/mips/fpu/fraiseexcpt.c
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@ -1,5 +1,5 @@
/* Raise given exceptions.
Copyright (C) 2000 Free Software Foundation, Inc.
Copyright (C) 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 2000.
@ -19,6 +19,7 @@
02111-1307 USA. */
#include <fenv.h>
#include <fenv_libc.h>
#include <fpu_control.h>
#include <shlib-compat.h>
@ -30,8 +31,13 @@ __feraiseexcept (int excepts)
/* Get current state. */
_FPU_GETCW (cw);
/* Set exceptions bits. */
cw |= (excepts & FE_ALL_EXCEPT);
/* Set flag bits (which are accumulative), and *also* set the cause
bits. The setting of the cause bits is what actually causes the
hardware to generate the exception, if the corresponding enable
bit is set as well. */
excepts &= FE_ALL_EXCEPT;
cw |= excepts | (excepts << CAUSE_SHIFT);
/* Set new state. */
_FPU_SETCW (cw);