[frange] Add op2_range for operator_not_equal.

We're missing an op2_range entry for operator_not_equal so GORI can
calculate an outgoing edge.  The false side of != is true and
guarantees we don't have a NAN, so it's important to get this right.
We eventually get it through an intersection of various ranges in
ranger, but it's best to get things correct as early as possible.

gcc/ChangeLog:

	* range-op-float.cc (operator_not_equal::op2_range): New.
	* range-op-mixed.h: Add operator_not_equal::op2_range.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/vrp-float-13.c: New test.

diff --git a/gcc/range-op-float.cc b/gcc/range-op-float.cc
index cc729e12a9ec0b2c24cebfd59e3563f64a3c78cd..91d3096fdac4a89968fed26404a57af69de283b4 100644 (file)
--- a/gcc/range-op-float.cc
+++ b/gcc/range-op-float.cc
@@ -900,6 +900,14 @@ operator_not_equal::op1_range (frange &r, tree type,
   return true;
 }
 
+bool
+operator_not_equal::op2_range (frange &r, tree type,
+                              const irange &lhs,
+                              const frange &op1,
+                              relation_trio trio) const
+{
+  return op1_range (r, type, lhs, op1, trio);
+}
 
 // Check if the LHS range indicates a relation between OP1 and OP2.
 

diff --git a/gcc/range-op-mixed.h b/gcc/range-op-mixed.h
index ef562326c1f770707f4184f7fae2434d5fdf07f1..f7ff47b2725900b1f9bf1ef75730bec78000aafa 100644 (file)
--- a/gcc/range-op-mixed.h
+++ b/gcc/range-op-mixed.h
@@ -164,6 +164,9 @@ public:
   bool op2_range (irange &r, tree type,
                  const irange &lhs, const irange &op1,
                  relation_trio = TRIO_VARYING) const final override;
+  bool op2_range (frange &r, tree type,
+                 const irange &lhs, const frange &op1,
+                 relation_trio = TRIO_VARYING) const final override;
 
   relation_kind op1_op2_relation (const irange &lhs, const irange &,
                                  const irange &) const final override;

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/vrp-float-13.c b/gcc/testsuite/gcc.dg/tree-ssa/vrp-float-13.c
new file mode 100644 (file)
index 0000000..f5a0164
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/vrp-float-13.c
@@ -0,0 +1,16 @@
+// { dg-do compile }
+// { dg-options "-O2 -fno-thread-jumps -fdisable-tree-fre1 -fdump-tree-evrp-details" }
+
+void a(float, float);
+void b(float, float);
+
+void foo(float x, float y)
+{
+  if (x != y)
+    a (x,y);
+  else if (x < y)
+    b (x,y);
+}
+
+// Test that the false side of if(x != y) has a range for y.
+// { dg-final { scan-tree-dump "2->4  \\(F\\) y_3\\(D\\)" "evrp" } }