diff options
Diffstat (limited to 'gcc/convert.c')
| -rw-r--r-- | gcc/convert.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/gcc/convert.c b/gcc/convert.c index f54b6d9adfe..48f3f944c71 100644 --- a/gcc/convert.c +++ b/gcc/convert.c @@ -30,6 +30,7 @@ along with GCC; see the file COPYING3. If not see #include "tree.h" #include "flags.h" #include "convert.h" +#include "diagnostic-core.h" #include "toplev.h" #include "langhooks.h" @@ -768,13 +769,19 @@ convert_to_integer (tree type, tree expr) || ex_form == LSHIFT_EXPR /* If we have !flag_wrapv, and either ARG0 or ARG1 is of a signed type, we have to do - PLUS_EXPR or MINUS_EXPR in an unsigned - type. Otherwise, we would introduce + PLUS_EXPR, MINUS_EXPR or MULT_EXPR in an unsigned + type in case the operation in outprec precision + could overflow. Otherwise, we would introduce signed-overflow undefinedness. */ || ((!TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0)) || !TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1))) + && ((TYPE_PRECISION (TREE_TYPE (arg0)) * 2u + > outprec) + || (TYPE_PRECISION (TREE_TYPE (arg1)) * 2u + > outprec)) && (ex_form == PLUS_EXPR - || ex_form == MINUS_EXPR))) + || ex_form == MINUS_EXPR + || ex_form == MULT_EXPR))) typex = unsigned_type_for (typex); else typex = signed_type_for (typex); |