[COMMITTED] PR tree-optimization/105597 - Check operand for type, not LHS.

[COMMITTED] PR tree-optimization/105597 - Check operand for type, not LHS.

[Andrew MacLeod]

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Earlier patch was picking the type of the expression in a minus 
operation from the LHS.   When we are folding, the LHS may not be 
defined yet.

Instead, pick up the type from operand 1, and ensure it isn't undefined 
while we're at it.

Bootstrapped on x86_64-pc-linux-gnu with no regressions.  Pushed.

Andrew

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commit e97e99296505e6015bc9e281364818bb89ca8a49
Author: Andrew MacLeod <amacleod@redhat.com>
Date:   Fri May 13 13:11:18 2022 -0400

    Check operand for type, not LHS.
    
    When folding, the LHS has not been set, so we should be checking the type of
    op1.  We should also make sure op1 is not undefined.
    
            PR tree-optimization/105597
            gcc/
            * range-op.cc (operator_minus::lhs_op1_relation): Use op1 instead
            of the lhs and make sure it is not undefined.
            gcc/testsuite/
            * gcc.dg/pr105597.c: New.

diff --git a/gcc/range-op.cc b/gcc/range-op.cc
index e6b32e288b0..c88da8caa6c 100644
--- a/gcc/range-op.cc
+++ b/gcc/range-op.cc
@@ -1343,10 +1343,10 @@ operator_minus::wi_fold (irange &r, tree type,
 // OP1 and OP2.
 
 relation_kind
-operator_minus::lhs_op1_relation (const irange &lhs, const irange &,
+operator_minus::lhs_op1_relation (const irange &, const irange &op1,
 				  const irange &, relation_kind rel) const
 {
-  if (TYPE_SIGN (lhs.type ()) == UNSIGNED)
+  if (!op1.undefined_p () && TYPE_SIGN (op1.type ()) == UNSIGNED)
     switch (rel)
       {
       case VREL_GT:
diff --git a/gcc/testsuite/gcc.dg/pr105597.c b/gcc/testsuite/gcc.dg/pr105597.c
new file mode 100644
index 00000000000..e463ec6c194
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr105597.c
@@ -0,0 +1,27 @@
+/* PR tree-optimization/105597 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wno-int-conversion" } */
+
+typedef struct {
+  int allocated;
+} vvec;
+
+int vvneeds_want, mgpssort;
+
+void vvinit(vvec *v, int minelems) { v->allocated = -minelems; }
+
+void vvneeds(vvec *v, int needed) {
+  if (needed > v->allocated)
+    if (v->allocated < 0)
+      ;
+    else {
+      int next = v->allocated + (v->allocated >> 1);
+      vvneeds_want = next;
+    }
+}
+
+void mgpssort_1() {
+  vvinit((vvec *) &mgpssort, mgpssort_1);
+  vvneeds((vvec *) &mgpssort, mgpssort_1);
+}
+