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commit: c355f9b13f537be7717c3dafe1510976cdb8584e |
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Author: Sergei Trofimovich <slyfox <AT> gentoo <DOT> org> |
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AuthorDate: Thu May 14 17:57:26 2020 +0000 |
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Commit: Sergei Trofimovich <slyfox <AT> gentoo <DOT> org> |
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CommitDate: Thu May 14 17:57:26 2020 +0000 |
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URL: https://gitweb.gentoo.org/proj/gcc-patches.git/commit/?id=c355f9b1 |
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|
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10.1.0: backport infinite loop in float print, bug #722774 |
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|
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Reported-by: Adrien Dessemond |
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Bug: https://gcc.gnu.org/PR95118 |
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Bug: https://bugs.gentoo.org/722774 |
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Signed-off-by: Sergei Trofimovich <slyfox <AT> gentoo.org> |
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|
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10.1.0/gentoo/29_all_fix-float-hang-PR95118.patch | 54 +++++++++++++++++++++++ |
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10.1.0/gentoo/README.history | 3 ++ |
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2 files changed, 57 insertions(+) |
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|
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diff --git a/10.1.0/gentoo/29_all_fix-float-hang-PR95118.patch b/10.1.0/gentoo/29_all_fix-float-hang-PR95118.patch |
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new file mode 100644 |
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index 0000000..5be8649 |
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--- /dev/null |
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+++ b/10.1.0/gentoo/29_all_fix-float-hang-PR95118.patch |
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@@ -0,0 +1,54 @@ |
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+https://gcc.gnu.org/PR95118 |
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+https://bugs.gentoo.org/722774 |
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+ |
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+From 568c985113b29574c4e25e1a016475668fc17c28 Mon Sep 17 00:00:00 2001 |
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+From: Richard Biener <rguenther@××××.de> |
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+Date: Thu, 14 May 2020 08:53:03 +0200 |
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+Subject: [PATCH] middle-end/95118 - fix printing of denormal zero |
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+ |
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+This fixes printing a REAL_CST generated from value-numbering |
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+punning some bits to a real which turns out as zero with big |
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+negative exponent. This causes the loop in real_to_decimal_for_mode to |
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+never terminate. |
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+ |
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+2020-05-14 Richard Biener <rguenther@××××.de> |
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+ |
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+ PR middle-end/95118 |
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+ * real.c (real_to_decimal_for_mode): Make sure we handle |
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+ a zero with nonzero exponent. |
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+ |
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+ * gcc.dg/pr95118.c: New testcase. |
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+--- |
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+ gcc/real.c | 4 ++-- |
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+ gcc/testsuite/gcc.dg/pr95118.c | 11 +++++++++++ |
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+ |
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+--- a/gcc/real.c |
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++++ b/gcc/real.c |
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+@@ -1714,8 +1714,8 @@ real_to_decimal_for_mode (char *str, const REAL_VALUE_TYPE *r_orig, |
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+ |
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+ do_multiply (&u, &v, ten); |
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+ |
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+- /* Stop if we're now >= 1. */ |
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+- if (REAL_EXP (&u) > 0) |
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++ /* Stop if we're now >= 1 or zero. */ |
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++ if (REAL_EXP (&u) > 0 || u.cl == rvc_zero) |
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+ break; |
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+ |
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+ v = u; |
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+--- /dev/null |
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++++ b/gcc/testsuite/gcc.dg/pr95118.c |
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+@@ -0,0 +1,11 @@ |
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++/* { dg-do compile } */ |
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++/* { dg-options "-O2 -fdump-tree-fre" } */ |
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++ |
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++void a(); |
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++void b() { |
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++ union { |
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++ int c[4]; |
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++ long double d; |
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++ } e = {{0, 0, 4}}; |
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++ a(e.d); |
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++} |
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+-- |
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+2.26.2 |
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+ |
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|
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diff --git a/10.1.0/gentoo/README.history b/10.1.0/gentoo/README.history |
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index 96d5640..0ed3a9d 100644 |
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--- a/10.1.0/gentoo/README.history |
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+++ b/10.1.0/gentoo/README.history |
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@@ -1,3 +1,6 @@ |
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+2 TODO |
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+ + 29_all_fix-float-hang-PR95118.patch |
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+ |
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1 05 May 2020 |
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+ 01_all_default-fortify-source.patch |
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+ 02_all_default-warn-format-security.patch |
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