diff options
Diffstat (limited to 'libgcc/soft-fp/op-common.h')
| -rw-r--r-- | libgcc/soft-fp/op-common.h | 37 |
1 files changed, 32 insertions, 5 deletions
diff --git a/libgcc/soft-fp/op-common.h b/libgcc/soft-fp/op-common.h index 67cdc33..6f8c1f3 100644 --- a/libgcc/soft-fp/op-common.h +++ b/libgcc/soft-fp/op-common.h @@ -1,5 +1,5 @@ /* Software floating-point emulation. Common operations. - Copyright (C) 1997-2013 Free Software Foundation, Inc. + Copyright (C) 1997-2014 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), @@ -32,7 +32,7 @@ #define _FP_DECL(wc, X) \ _FP_I_TYPE X##_c __attribute__ ((unused)); \ _FP_I_TYPE X##_s __attribute__ ((unused)); \ - _FP_I_TYPE X##_e; \ + _FP_I_TYPE X##_e __attribute__ ((unused)); \ _FP_FRAC_DECL_##wc (X) /* Test whether the qNaN bit denotes a signaling NaN. */ @@ -191,8 +191,22 @@ #define _FP_PACK_SEMIRAW(fs, wc, X) \ do \ { \ + int _FP_PACK_SEMIRAW_is_tiny \ + = X##_e == 0 && !_FP_FRAC_ZEROP_##wc (X); \ + if (_FP_TININESS_AFTER_ROUNDING \ + && _FP_PACK_SEMIRAW_is_tiny) \ + { \ + FP_DECL_##fs (_FP_PACK_SEMIRAW_T); \ + _FP_FRAC_COPY_##wc (_FP_PACK_SEMIRAW_T, X); \ + _FP_PACK_SEMIRAW_T##_s = X##_s; \ + _FP_PACK_SEMIRAW_T##_e = X##_e; \ + _FP_FRAC_SLL_##wc (_FP_PACK_SEMIRAW_T, 1); \ + _FP_ROUND (wc, _FP_PACK_SEMIRAW_T); \ + if (_FP_FRAC_OVERP_##wc (fs, _FP_PACK_SEMIRAW_T)) \ + _FP_PACK_SEMIRAW_is_tiny = 0; \ + } \ _FP_ROUND (wc, X); \ - if (X##_e == 0 && !_FP_FRAC_ZEROP_##wc (X)) \ + if (_FP_PACK_SEMIRAW_is_tiny) \ { \ if ((FP_CUR_EXCEPTIONS & FP_EX_INEXACT) \ || (FP_TRAPPING_EXCEPTIONS & FP_EX_UNDERFLOW)) \ @@ -279,6 +293,17 @@ else \ { \ /* we've got a denormalized number */ \ + int _FP_PACK_CANONICAL_is_tiny = 1; \ + if (_FP_TININESS_AFTER_ROUNDING && X##_e == 0) \ + { \ + FP_DECL_##fs (_FP_PACK_CANONICAL_T); \ + _FP_FRAC_COPY_##wc (_FP_PACK_CANONICAL_T, X); \ + _FP_PACK_CANONICAL_T##_s = X##_s; \ + _FP_PACK_CANONICAL_T##_e = X##_e; \ + _FP_ROUND (wc, _FP_PACK_CANONICAL_T); \ + if (_FP_FRAC_OVERP_##wc (fs, _FP_PACK_CANONICAL_T)) \ + _FP_PACK_CANONICAL_is_tiny = 0; \ + } \ X##_e = -X##_e + 1; \ if (X##_e <= _FP_WFRACBITS_##fs) \ { \ @@ -296,8 +321,10 @@ X##_e = 0; \ _FP_FRAC_SRL_##wc (X, _FP_WORKBITS); \ } \ - if ((FP_CUR_EXCEPTIONS & FP_EX_INEXACT) \ - || (FP_TRAPPING_EXCEPTIONS & FP_EX_UNDERFLOW)) \ + if (_FP_PACK_CANONICAL_is_tiny \ + && ((FP_CUR_EXCEPTIONS & FP_EX_INEXACT) \ + || (FP_TRAPPING_EXCEPTIONS \ + & FP_EX_UNDERFLOW))) \ FP_SET_EXCEPTION (FP_EX_UNDERFLOW); \ } \ else \ |