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| author | Richard Biener <rguenther@suse.de> | 2014-10-23 08:25:55 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2014-10-23 08:25:55 +0000 |
| commit | 4d885a639e4a72665b95fa895032d2600418d390 (patch) | |
| tree | 004e2ca23be9197e0f29a83864df1f382bc5f99b /gcc | |
| parent | a15d2ea8adf0aeb4e02872b0fb55b513035de2d6 (diff) | |
| download | gcc-4d885a639e4a72665b95fa895032d2600418d390.zip gcc-4d885a639e4a72665b95fa895032d2600418d390.tar.gz gcc-4d885a639e4a72665b95fa895032d2600418d390.tar.bz2 | |
fold-const.c (fold_binary_loc): Preserve side-effects of X - X when simplifying to 0.
2014-10-22 Richard Biener <rguenther@suse.de>
* fold-const.c (fold_binary_loc): Preserve side-effects of
X - X when simplifying to 0.
* stor-layout.c (finish_bitfield_representative): Strip
side-effects of evaluating the difference of two DECL_FIELD_OFFSET.
From-SVN: r216575
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/fold-const.c | 2 | ||||
| -rw-r--r-- | gcc/stor-layout.c | 2 |
3 files changed, 10 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 5bc8b64..fa3a9cc 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2014-10-23 Richard Biener <rguenther@suse.de> + + * fold-const.c (fold_binary_loc): Preserve side-effects of + X - X when simplifying to 0. + * stor-layout.c (finish_bitfield_representative): Strip + side-effects of evaluating the difference of two DECL_FIELD_OFFSET. + 2014-10-22 Richard Biener <rguenther@suse.de> Tobias Burnus <burnus@net-b.de> diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 1e7e932..d70658c3 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -10749,7 +10749,7 @@ fold_binary_loc (location_t loc, if ((!FLOAT_TYPE_P (type) || !HONOR_NANS (TYPE_MODE (type))) && operand_equal_p (arg0, arg1, 0)) - return build_zero_cst (type); + return omit_one_operand_loc (loc, type, build_zero_cst (type), arg0); /* A - B -> A + (-B) if B is easily negatable. */ if (negate_expr_p (arg1) diff --git a/gcc/stor-layout.c b/gcc/stor-layout.c index 237cf69..9f0064b 100644 --- a/gcc/stor-layout.c +++ b/gcc/stor-layout.c @@ -1860,6 +1860,8 @@ finish_bitfield_representative (tree repr, tree field) size = size_diffop (DECL_FIELD_OFFSET (field), DECL_FIELD_OFFSET (repr)); + while (TREE_CODE (size) == COMPOUND_EXPR) + size = TREE_OPERAND (size, 1); gcc_assert (tree_fits_uhwi_p (size)); bitsize = (tree_to_uhwi (size) * BITS_PER_UNIT + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (field)) |