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Fix underflow generation in soft-fp.

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* soft-fp/soft-fp.h (FP_CUR_EXCEPTIONS): Define.
	(FP_TRAPPING_EXCEPTIONS): Provide default implementation.
	* sysdeps/sparc/sparc32/soft-fp/sfp-machine.h
	(FP_TRAPPING_EXCEPTIONS): Define.
	* sysdeps/sparc/sparc64/soft-fp/sfp-machine.h
	(FP_TRAPPING_EXCEPTIONS): Define.
	* soft-fp/op-common.h (_FP_PACK_SEMIRAW): Signal underflow for
	subnormals only when inexact has been signalled or underflow
	exceptions are enabled.
	(_FP_PACK_CANONICAL): Likewise.
This commit is contained in:
David S. Miller 2012-05-30 13:41:01 -07:00
parent 35c166e492
commit ae251b0b58
5 changed files with 34 additions and 5 deletions
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13
ChangeLog
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@ -1,3 +1,16 @@
2012-05-30 David S. Miller <davem@davemloft.net>
* soft-fp/soft-fp.h (FP_CUR_EXCEPTIONS): Define.
(FP_TRAPPING_EXCEPTIONS): Provide default implementation.
* sysdeps/sparc/sparc32/soft-fp/sfp-machine.h
(FP_TRAPPING_EXCEPTIONS): Define.
* sysdeps/sparc/sparc64/soft-fp/sfp-machine.h
(FP_TRAPPING_EXCEPTIONS): Define.
* soft-fp/op-common.h (_FP_PACK_SEMIRAW): Signal underflow for
subnormals only when inexact has been signalled or underflow
exceptions are enabled.
(_FP_PACK_CANONICAL): Likewise.
2012-05-30 H.J. Lu <hongjiu.lu@intel.com>
[BZ #14183]

13
soft-fp/op-common.h
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@ -1,5 +1,5 @@
/* Software floating-point emulation. Common operations.
Copyright (C) 1997,1998,1999,2006,2007 Free Software Foundation, Inc.
Copyright (C) 1997,1998,1999,2006,2007,2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson (rth@cygnus.com),
Jakub Jelinek (jj@ultra.linux.cz),
@ -146,7 +146,11 @@ do { \
if (!_FP_EXP_NORMAL(fs, wc, X) && !_FP_FRAC_ZEROP_##wc(X)) \
{ \
if (X##_e == 0) \
FP_SET_EXCEPTION(FP_EX_UNDERFLOW); \
{ \
if ((FP_CUR_EXCEPTIONS & FP_EX_INEXACT) \
|| (FP_TRAPPING_EXCEPTIONS & FP_EX_UNDERFLOW)) \
FP_SET_EXCEPTION(FP_EX_UNDERFLOW); \
} \
else \
{ \
if (!_FP_KEEPNANFRACP) \
@ -226,13 +230,16 @@ do { \
{ \
X##_e = 1; \
_FP_FRAC_SET_##wc(X, _FP_ZEROFRAC_##wc); \
FP_SET_EXCEPTION(FP_EX_INEXACT); \
} \
else \
{ \
X##_e = 0; \
_FP_FRAC_SRL_##wc(X, _FP_WORKBITS); \
FP_SET_EXCEPTION(FP_EX_UNDERFLOW); \
} \
if ((FP_CUR_EXCEPTIONS & FP_EX_INEXACT) \
|| (FP_TRAPPING_EXCEPTIONS & FP_EX_UNDERFLOW)) \
FP_SET_EXCEPTION(FP_EX_UNDERFLOW); \
} \
else \
{ \

7
soft-fp/soft-fp.h
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@ -128,6 +128,13 @@
#define FP_CLEAR_EXCEPTIONS \
_fex = 0
#define FP_CUR_EXCEPTIONS \
(_fex)
#ifndef FP_TRAPPING_EXCEPTIONS
#define FP_TRAPPING_EXCEPTIONS 0
#endif
#define _FP_ROUND_NEAREST(wc, X) \
do { \
if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND) \

3
sysdeps/sparc/sparc32/soft-fp/sfp-machine.h
View File

@ -1,6 +1,6 @@
/* Machine-dependent software floating-point definitions.
Sparc userland (_Q_*) version.
Copyright (C) 1997,1998,1999, 2002, 2006 Free Software Foundation, Inc.
Copyright (C) 1997,1998,1999,2002,2006,2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson (rth@cygnus.com),
Jakub Jelinek (jj@ultra.linux.cz) and
@ -192,6 +192,7 @@ do { \
_FPU_GETCW(_fcw); \
} while (0)
#define FP_TRAPPING_EXCEPTIONS ((_fcw >> 23) & 0x1f)
#define FP_INHIBIT_RESULTS ((_fcw >> 23) & _fex)
/* Simulate exceptions using double arithmetics. */

3
sysdeps/sparc/sparc64/soft-fp/sfp-machine.h
View File

@ -1,6 +1,6 @@
/* Machine-dependent software floating-point definitions.
Sparc64 userland (_Q_* and _Qp_*) version.
Copyright (C) 1997, 1998, 1999, 2006 Free Software Foundation, Inc.
Copyright (C) 1997, 1998, 1999, 2006, 2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson (rth@cygnus.com),
Jakub Jelinek (jj@ultra.linux.cz) and
@ -100,6 +100,7 @@ do { \
_FPU_GETCW(_fcw); \
} while (0)
#define FP_TRAPPING_EXCEPTIONS ((_fcw >> 23) & 0x1f)
#define FP_INHIBIT_RESULTS ((_fcw >> 23) & _fex)
/* Simulate exceptions using double arithmetics. */