diff options
Diffstat (limited to 'gcc/system.h')
| -rw-r--r-- | gcc/system.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/system.h b/gcc/system.h index 55a9370aca4..7cf3b5fe8bf 100644 --- a/gcc/system.h +++ b/gcc/system.h @@ -168,6 +168,16 @@ extern int errno; /* Get definitions of HOST_WIDE_INT and HOST_WIDEST_INT. */ #include "hwint.h" +/* A macro to determine whether a VALUE lies inclusively within a + certain range without evaluating the VALUE more than once. This + macro won't warn if the VALUE is unsigned and the LOWER bound is + zero, as it would e.g. with "VALUE >= 0 && ...". Note the LOWER + bound *is* evaluated twice, and LOWER must not be greater than + UPPER. However the bounds themselves can be either positive or + negative. */ +#define IN_RANGE(VALUE, LOWER, UPPER) \ + ((unsigned HOST_WIDE_INT)((VALUE) - (LOWER)) <= ((UPPER) - (LOWER))) + /* Infrastructure for defining missing _MAX and _MIN macros. Note that macros defined with these cannot be used in #if. */ |
