From 758671b88b78d7629376b118ec6ca6bcfbabbd36 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Fri, 25 Feb 2022 10:55:17 +0100
Subject: [PATCH] match.pd: Don't create BIT_NOT_EXPRs for COMPLEX_TYPE
 [PR104675]

We don't support BIT_{AND,IOR,XOR,NOT}_EXPR on complex types,
&/|/^ are just rejected for them, and ~ is parsed as CONJ_EXPR.
So, we should avoid simplifications which turn valid complex type
expressions into something that will ICE during expansion.

2022-02-25  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/104675
	* match.pd (-A - 1 -> ~A, -1 - A -> ~A): Don't simplify for
	COMPLEX_TYPE.

	* gcc.dg/pr104675-1.c: New test.
	* gcc.dg/pr104675-2.c: New test.
---
 gcc/match.pd                      |  4 +++-
 gcc/testsuite/gcc.dg/pr104675-1.c | 29 +++++++++++++++++++++++++++++
 gcc/testsuite/gcc.dg/pr104675-2.c | 18 ++++++++++++++++++
 3 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.dg/pr104675-1.c
 create mode 100644 gcc/testsuite/gcc.dg/pr104675-2.c

diff --git a/gcc/match.pd b/gcc/match.pd
index cf78a11ddd4..0bd0ac887e6 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -2776,13 +2776,15 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
   (simplify
    (minus (convert? (negate @0)) integer_each_onep)
    (if (!TYPE_OVERFLOW_TRAPS (type)
+	&& TREE_CODE (type) != COMPLEX_TYPE
 	&& tree_nop_conversion_p (type, TREE_TYPE (@0)))
     (bit_not (convert @0))))
 
   /* -1 - A -> ~A */
   (simplify
    (minus integer_all_onesp @0)
-   (bit_not @0))
+   (if (TREE_CODE (type) != COMPLEX_TYPE)
+    (bit_not @0)))
 
   /* (T)(P + A) - (T)P -> (T) A */
   (simplify
diff --git a/gcc/testsuite/gcc.dg/pr104675-1.c b/gcc/testsuite/gcc.dg/pr104675-1.c
new file mode 100644
index 00000000000..af0b4390c30
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr104675-1.c
@@ -0,0 +1,29 @@
+/* PR tree-optimization/104675 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+_Complex int
+foo (_Complex int a)
+{
+  return (-1 + -1i) - a;
+}
+
+_Complex int
+bar (_Complex int a)
+{
+  return -a - (1 + 1i);
+}
+
+_Complex int
+baz (_Complex int a)
+{
+  _Complex int b = -1 + -1i;
+  return b - a;
+}
+
+_Complex int
+qux (_Complex int a)
+{
+  _Complex int b = 1 + 1i;
+  return -a - b;
+}
diff --git a/gcc/testsuite/gcc.dg/pr104675-2.c b/gcc/testsuite/gcc.dg/pr104675-2.c
new file mode 100644
index 00000000000..037d0c4f10d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr104675-2.c
@@ -0,0 +1,18 @@
+/* PR tree-optimization/104675 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+void baz (int i);
+
+void
+bar (_Complex int c, short s)
+{
+  c -= s;
+  baz (__real__ c + __imag__ c);
+}
+
+void
+foo (void)
+{
+  bar (-1 - 1i, 0);
+}