From 4e306222f442f8d4c6fc6da997ab756a5e43e36e Mon Sep 17 00:00:00 2001
From: Aldy Hernandez <aldyh@redhat.com>
Date: Thu, 17 Nov 2022 16:47:17 +0100
Subject: [PATCH] [PR tree-optimization/107732] [range-ops] Handle attempt to
 abs() negatives.

The threader is creating a scenario where we are trying to solve:

	[NEGATIVES] = abs(x)

While solving this we have an intermediate value of UNDEFINED because
we have no positive numbers.  But then we try to union the negative
pair to the final result by querying the bounds.  Since neither
UNDEFINED nor NAN have bounds, they need to be specially handled.

	PR tree-optimization/107732

gcc/ChangeLog:

	* range-op-float.cc (foperator_abs::op1_range): Early exit when
	result is undefined.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/pr107732.c: New test.
---
 gcc/range-op-float.cc                    |  2 +-
 gcc/testsuite/gcc.dg/tree-ssa/pr107732.c | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/pr107732.c

diff --git a/gcc/range-op-float.cc b/gcc/range-op-float.cc
index adb0cbaa6d58..ee88511eba0b 100644
--- a/gcc/range-op-float.cc
+++ b/gcc/range-op-float.cc
@@ -1407,7 +1407,7 @@ foperator_abs::op1_range (frange &r, tree type,
       neg_nan.set_nan (type, true);
       r.union_ (neg_nan);
     }
-  if (r.known_isnan ())
+  if (r.known_isnan () || r.undefined_p ())
     return true;
   // Then add the negative of each pair:
   // ABS(op1) = [5,20] would yield op1 => [-20,-5][5,20].
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr107732.c b/gcc/testsuite/gcc.dg/tree-ssa/pr107732.c
new file mode 100644
index 000000000000..b216f38db0ef
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr107732.c
@@ -0,0 +1,13 @@
+// { dg-do compile }
+// { dg-options "-O2" }
+
+double sqrt(double);
+double a, b, c;
+void d() {
+  for (;;) {
+    c = __builtin_fabs(a);
+    sqrt(c);
+    if (a)
+      a = b;
+  }
+}