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| author | David S. Miller <davem@davemloft.net> | 2012-05-30 13:41:01 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-05-30 13:41:01 -0700 |
| commit | ae251b0b58b6fff00a572fe1497eddec8433a9d3 (patch) | |
| tree | 84a641823647c7996b6269b18276e722e9cb8022 /soft-fp | |
| parent | 35c166e492b1c806b1e0c1d26f4e1385a7cfb055 (diff) | |
| download | glibc-ae251b0b58b6fff00a572fe1497eddec8433a9d3.tar.gz | |
Fix underflow generation in soft-fp.
* 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.
Diffstat (limited to 'soft-fp')
| -rw-r--r-- | soft-fp/op-common.h | 13 | ||||
| -rw-r--r-- | soft-fp/soft-fp.h | 7 |
2 files changed, 17 insertions, 3 deletions
diff --git a/soft-fp/op-common.h b/soft-fp/op-common.h index b70026f909..db75af53e6 100644 --- a/soft-fp/op-common.h +++ b/soft-fp/op-common.h @@ -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 \ { \ diff --git a/soft-fp/soft-fp.h b/soft-fp/soft-fp.h index 46cb1cfaef..750c7fea2d 100644 --- a/soft-fp/soft-fp.h +++ b/soft-fp/soft-fp.h @@ -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) \ |