diff options
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 16 |
1 files changed, 8 insertions, 8 deletions
@@ -5793,18 +5793,18 @@ highest_pow2_factor (exp) { case INTEGER_CST: /* If the integer is expressable in a HOST_WIDE_INT, we can find the - lowest bit that's a one. If the result is zero, pessimize by - returning 1. This is overly-conservative, but such things should not - happen in the offset expressions that we are called with. If - the constant overlows, we some erroneous program, so return - BIGGEST_ALIGNMENT to avoid any later ICE. */ - if (TREE_CONSTANT_OVERFLOW (exp)) + lowest bit that's a one. If the result is zero, return + BIGGEST_ALIGNMENT. We need to handle this case since we can find it + in a COND_EXPR, a MIN_EXPR, or a MAX_EXPR. If the constant overlows, + we have an erroneous program, so return BIGGEST_ALIGNMENT to avoid any + later ICE. */ + if (TREE_CONSTANT_OVERFLOW (exp) + || integer_zerop (exp)) return BIGGEST_ALIGNMENT; else if (host_integerp (exp, 0)) { c0 = tree_low_cst (exp, 0); - c0 = c0 < 0 ? - c0 : c0; - return c0 != 0 ? c0 & -c0 : 1; + return c0 < 0 ? - c0 : c0; } break; |