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https://gcc.gnu.org/PR95118
https://bugs.gentoo.org/722774
From 568c985113b29574c4e25e1a016475668fc17c28 Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Thu, 14 May 2020 08:53:03 +0200
Subject: [PATCH] middle-end/95118 - fix printing of denormal zero
This fixes printing a REAL_CST generated from value-numbering
punning some bits to a real which turns out as zero with big
negative exponent. This causes the loop in real_to_decimal_for_mode to
never terminate.
2020-05-14 Richard Biener <rguenther@suse.de>
PR middle-end/95118
* real.c (real_to_decimal_for_mode): Make sure we handle
a zero with nonzero exponent.
* gcc.dg/pr95118.c: New testcase.
---
gcc/real.c | 4 ++--
gcc/testsuite/gcc.dg/pr95118.c | 11 +++++++++++
--- a/gcc/real.c
+++ b/gcc/real.c
@@ -1714,8 +1714,8 @@ real_to_decimal_for_mode (char *str, const REAL_VALUE_TYPE *r_orig,
do_multiply (&u, &v, ten);
- /* Stop if we're now >= 1. */
- if (REAL_EXP (&u) > 0)
+ /* Stop if we're now >= 1 or zero. */
+ if (REAL_EXP (&u) > 0 || u.cl == rvc_zero)
break;
v = u;
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr95118.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-fre" } */
+
+void a();
+void b() {
+ union {
+ int c[4];
+ long double d;
+ } e = {{0, 0, 4}};
+ a(e.d);
+}
--
2.26.2
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