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Fix underflow reporting and tie up loose ends in sparc soft-fp.

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* sysdeps/sparc/sparc32/soft-fp/q_util.c (___Q_numbers): Delete.
	(___Q_zero): New.
	(__Q_simulate_exceptions): Return void.  Change to simulate
	exceptions by writing into the %fsr.
	* sysdeps/sparc/sparc64/soft-fp/qp_util.c
	(__Qp_handle_exceptions): Likewise.
	(numbers): Delete.
	* sysdeps/sparc/sparc64/soft-fp/Versions: Remove entry for
	__Qp_handle_exceptions.
	* sysdeps/unix/sysv/linux/sparc/sparc64/nptl/libc.abilist: Remove
	__Qp_handle_exceptions.
	* sysdeps/sparc/sparc32/soft-fp/sfp-machine.h (_FP_DECL_EX): Mark
	as unused and give dummy FP_RND_NEAREST initializer.
	(FP_INHIBIT_RESULTS): Define.
	(___Q_simulate_exceptions): Update declaration.
	(FP_HANDLE_EXCEPTIONS): Use ___Q_zero and tidy inline asm
	formatting.
	* sysdeps/sparc/sparc64/soft-fp/sfp-machine.h (_FP_DECL_EX): Mark
	as unused and give dummy FP_RND_NEAREST initializer.
	(__Qp_handle_exceptions): Update declaration.
	(FP_HANDLE_EXCEPTIONS, QP_NO_EXCEPTIONS): Tidy inline asm
	formatting.
This commit is contained in:
David S. Miller
2012-05-27 21:02:14 -07:00
parent 04fb54b507
commit d66ef399f5
7 changed files with 78 additions and 80 deletions
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49
sysdeps/sparc/sparc64/soft-fp/qp_util.c
View File

@ -1,7 +1,7 @@
/* Software floating-point emulation.
Helper routine for _Qp_* routines.
Simulate exceptions using double arithmetics.
Copyright (C) 1999 Free Software Foundation, Inc.
Copyright (C) 1999, 2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek (jj@ultra.linux.cz).
@ -21,36 +21,21 @@
#include "soft-fp.h"
static unsigned long numbers [] = {
0x7fef000000000000UL, /* A huge double number */
0x0010100000000000UL, /* Very tiny number */
0x0010000000000000UL, /* Minimum normalized number */
0x0000000000000000UL, /* Zero */
};
double __Qp_handle_exceptions(int exceptions)
void __Qp_handle_exceptions(int exceptions)
{
double d, *p = (double *)numbers;
if (exceptions & FP_EX_INVALID)
d = p[3]/p[3];
if (exceptions & FP_EX_OVERFLOW)
{
d = p[0] + p[0];
exceptions &= ~FP_EX_INEXACT;
}
if (exceptions & FP_EX_UNDERFLOW)
{
if (exceptions & FP_EX_INEXACT)
{
d = p[2] * p[2];
exceptions &= ~FP_EX_INEXACT;
}
else
d = p[1] - p[2];
}
if (exceptions & FP_EX_DIVZERO)
d = 1.0/p[3];
if (exceptions & FP_EX_INEXACT)
d = p[0] - p[2];
return d;
fpu_control_t fcw;
int tem, ou;
_FPU_GETCW(fcw);
tem = (fcw >> 23) & 0x1f;
ou = exceptions & (FP_EX_OVERFLOW | FP_EX_UNDERFLOW);
if (ou & tem)
exceptions &= ~FP_EX_INVALID;
fcw &= ~0x1f;
fcw |= (exceptions | (exceptions << 5));
_FPU_SETCW(fcw);
}