[gcc r12-2262] Add relation processing to ubsan builtins.

[gcc r12-2262] Add relation processing to ubsan builtins.

[Andrew Macleod]

https://gcc.gnu.org/g:9693ecdf7ed5dde9618d06560697ff8ee5e1e6b7

commit r12-2262-g9693ecdf7ed5dde9618d06560697ff8ee5e1e6b7
Author: Andrew MacLeod <amacleod@redhat.com>
Date:   Mon Jul 12 14:38:42 2021 -0400

    Add relation processing to ubsan builtins.
    
    Ubsan builtins call the plus/minus/multiple fold routines, but did not
    use any relation information between the 2 operands that is available.
    query and pass any relations.
    This resolves gcc.dg/pr97505.c when operating in ranger-only mode.
    
            * gimple-range-fold.cc (fold_using_range::range_of_builtin_ubsan_call):
            Query relation between the 2 operands and use it.

Diff:
---
 gcc/gimple-range-fold.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc
index 1fa4ace32b9..eff5d1f89f2 100644
--- a/gcc/gimple-range-fold.cc
+++ b/gcc/gimple-range-fold.cc
@@ -825,12 +825,14 @@ fold_using_range::range_of_builtin_ubsan_call (irange &r, gcall *call,
   tree arg1 = gimple_call_arg (call, 1);
   src.get_operand (ir0, arg0);
   src.get_operand (ir1, arg1);
+  // Check for any relation between arg0 and arg1.
+  relation_kind relation = src.query_relation (arg0, arg1);
 
   bool saved_flag_wrapv = flag_wrapv;
   // Pretend the arithmetic is wrapping.  If there is any overflow,
   // we'll complain, but will actually do wrapping operation.
   flag_wrapv = 1;
-  op->fold_range (r, type, ir0, ir1);
+  op->fold_range (r, type, ir0, ir1, relation);
   flag_wrapv = saved_flag_wrapv;
 
   // If for both arguments vrp_valueize returned non-NULL, this should