diff options
| author | Eric Botcazou <ebotcazou@adacore.com> | 2012-11-30 22:36:07 +0000 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2012-11-30 22:36:07 +0000 |
| commit | a37d67b62172f4835d32a83bf54c8c1b4d171271 (patch) | |
| tree | 8742e0d457e3f981f7a1906fe1a27dfb6a4e6600 /gcc/stor-layout.c | |
| parent | d5651dcfe8b168b8e91a7fe1d32bc955187f9177 (diff) | |
| download | gcc-a37d67b62172f4835d32a83bf54c8c1b4d171271.zip gcc-a37d67b62172f4835d32a83bf54c8c1b4d171271.tar.gz gcc-a37d67b62172f4835d32a83bf54c8c1b4d171271.tar.bz2 | |
stor-layout.c (bit_field_mode_iterator::bit_field_mode_iterator): Deal with degenerate cases where the bitsize isn't positive.
* stor-layout.c (bit_field_mode_iterator::bit_field_mode_iterator): Deal
with degenerate cases where the bitsize isn't positive. Rework comment.
From-SVN: r194009
Diffstat (limited to 'gcc/stor-layout.c')
| -rw-r--r-- | gcc/stor-layout.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/gcc/stor-layout.c b/gcc/stor-layout.c index 3d97796..4227694 100644 --- a/gcc/stor-layout.c +++ b/gcc/stor-layout.c @@ -2648,10 +2648,14 @@ bit_field_mode_iterator { if (!bitregion_end_) { - /* We can assume that any aligned chunk of UNITS bits that overlaps - the bitfield is mapped and won't trap. */ - unsigned HOST_WIDE_INT units = MIN (align, MAX (BIGGEST_ALIGNMENT, - BITS_PER_WORD)); + /* We can assume that any aligned chunk of ALIGN bits that overlaps + the bitfield is mapped and won't trap, provided that ALIGN isn't + too large. The cap is the biggest required alignment for data, + or at least the word size. And force one such chunk at least. */ + unsigned HOST_WIDE_INT units + = MIN (align, MAX (BIGGEST_ALIGNMENT, BITS_PER_WORD)); + if (bitsize <= 0) + bitsize = 1; bitregion_end_ = bitpos + bitsize + units - 1; bitregion_end_ -= bitregion_end_ % units + 1; } |