diff options
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c index 3e8ea95..277bbe8 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -248,7 +248,7 @@ static bool get_object_alignment_2 (tree exp, unsigned int *alignp, unsigned HOST_WIDE_INT *bitposp, bool addr_p) { - HOST_WIDE_INT bitsize, bitpos; + poly_int64 bitsize, bitpos; tree offset; machine_mode mode; int unsignedp, reversep, volatilep; @@ -373,8 +373,17 @@ get_object_alignment_2 (tree exp, unsigned int *alignp, } } + /* Account for the alignment of runtime coefficients, so that the constant + bitpos is guaranteed to be accurate. */ + unsigned int alt_align = ::known_alignment (bitpos - bitpos.coeffs[0]); + if (alt_align != 0 && alt_align < align) + { + align = alt_align; + known_alignment = false; + } + *alignp = align; - *bitposp = bitpos & (*alignp - 1); + *bitposp = bitpos.coeffs[0] & (align - 1); return known_alignment; } |