diff options
Diffstat (limited to 'gcc/tree-vrp.c')
| -rw-r--r-- | gcc/tree-vrp.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index d26011a..1adb919 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -1415,6 +1415,22 @@ extract_range_from_binary_expr_1 (value_range *vr, range and see what we end up with. */ if (code == PLUS_EXPR || code == MINUS_EXPR) { + /* This will normalize things such that calculating + [0,0] - VR_VARYING is not dropped to varying, but is + calculated as [MIN+1, MAX]. */ + if (vr0.type == VR_VARYING) + { + vr0.type = VR_RANGE; + vr0.min = vrp_val_min (expr_type); + vr0.max = vrp_val_max (expr_type); + } + if (vr1.type == VR_VARYING) + { + vr1.type = VR_RANGE; + vr1.min = vrp_val_min (expr_type); + vr1.max = vrp_val_max (expr_type); + } + const bool minus_p = (code == MINUS_EXPR); tree min_op0 = vr0.min; tree min_op1 = minus_p ? vr1.max : vr1.min; |