diff options
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 27 |
1 files changed, 10 insertions, 17 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index c2cf1a9..632a241 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -992,26 +992,19 @@ wide_int_binop (wide_int &res, res = wi::bit_and (arg1, arg2); break; - case RSHIFT_EXPR: case LSHIFT_EXPR: if (wi::neg_p (arg2)) - { - tmp = -arg2; - if (code == RSHIFT_EXPR) - code = LSHIFT_EXPR; - else - code = RSHIFT_EXPR; - } - else - tmp = arg2; + return false; + res = wi::lshift (arg1, arg2); + break; - if (code == RSHIFT_EXPR) - /* It's unclear from the C standard whether shifts can overflow. - The following code ignores overflow; perhaps a C standard - interpretation ruling is needed. */ - res = wi::rshift (arg1, tmp, sign); - else - res = wi::lshift (arg1, tmp); + case RSHIFT_EXPR: + if (wi::neg_p (arg2)) + return false; + /* It's unclear from the C standard whether shifts can overflow. + The following code ignores overflow; perhaps a C standard + interpretation ruling is needed. */ + res = wi::rshift (arg1, arg2, sign); break; case RROTATE_EXPR: |