From: Jakub Jelinek <jakub@redhat.com>
Date: Mon, 17 Jul 2017 10:20:41 +0000 (+0200)
Subject: re PR tree-optimization/81428 (ICE: in build_one_cst, at tree.c:2079 with -O2. Fixed... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9ebce098585220299a78ecda84b145d16ee25bca;p=gcc.git

re PR tree-optimization/81428 (ICE: in build_one_cst, at tree.c:2079 with -O2. Fixed point division.)

	PR tree-optimization/81428
	* match.pd (X / X -> one): Don't optimize _Fract divisions, as 1
	can't be built for those types.

	* gcc.dg/fixed-point/pr81428.c: New test.

From-SVN: r250265
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index db3540155ef..0c279095cf4 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-07-17  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/81428
+	* match.pd (X / X -> one): Don't optimize _Fract divisions, as 1
+	can't be built for those types.
+
 2017-07-17  Georg-Johann Lay  <avr@gjlay.de>
 
 	Remove stuff dead since r239246.
diff --git a/gcc/match.pd b/gcc/match.pd
index 4c64b21b463..979085aba5a 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -243,8 +243,9 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
  /* X / X is one.  */
  (simplify
   (div @0 @0)
-  /* But not for 0 / 0 so that we can get the proper warnings and errors.  */
-  (if (!integer_zerop (@0))
+  /* But not for 0 / 0 so that we can get the proper warnings and errors.
+     And not for _Fract types where we can't build 1.  */
+  (if (!integer_zerop (@0) && !ALL_FRACT_MODE_P (TYPE_MODE (type)))
    { build_one_cst (type); }))
  /* X / abs (X) is X < 0 ? -1 : 1.  */ 
  (simplify
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 141d035cf6d..4924b481427 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2017-07-17  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/81428
+	* gcc.dg/fixed-point/pr81428.c: New test.
+
 	PR tree-optimization/81365
 	* g++.dg/torture/pr81365.C: New test.
 
diff --git a/gcc/testsuite/gcc.dg/fixed-point/pr81428.c b/gcc/testsuite/gcc.dg/fixed-point/pr81428.c
new file mode 100644
index 00000000000..98f4b235718
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/fixed-point/pr81428.c
@@ -0,0 +1,9 @@
+/* PR tree-optimization/81428 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+void
+foo (long _Fract *a, long _Fract *b)
+{
+  *b = *a / *a;
+}