From: Jakub Jelinek <jakub@redhat.com>
Date: Mon, 25 Jun 2018 17:31:23 +0000 (+0200)
Subject: backport: re PR target/84772 (powerpc-spe: Spurious "is used uninitialized" warning... 
X-Git-Tag: releases/gcc-6.5.0~210
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=767b067a3418e05d40591bc6c5366d352f49ea63;p=thirdparty%2Fgcc.git

backport: re PR target/84772 (powerpc-spe: Spurious "is used uninitialized" warning, or possibly incorrect codegen for va_arg(long double))

	Backported from mainline
	2018-03-09  Jakub Jelinek  <jakub@redhat.com>

	PR target/84772
	* config/rs6000/rs6000.c (rs6000_gimplify_va_arg): Mark va_arg_tmp
	temporary TREE_ADDRESSABLE before gimplification of BUILT_IN_MEMCPY.

	* gcc.dg/pr84772.c: New test.

From-SVN: r262074
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2873eb9a01cc..6923e64fbde2 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -3,6 +3,10 @@
 	Backported from mainline
 	2018-03-09  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/84772
+	* config/rs6000/rs6000.c (rs6000_gimplify_va_arg): Mark va_arg_tmp
+	temporary TREE_ADDRESSABLE before gimplification of BUILT_IN_MEMCPY.
+
 	PR c++/84767
 	* tree-inline.c (copy_tree_body_r): For INDIRECT_REF of a remapped
 	decl, use remap_type if we want to use the type.
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index ec2b32b99518..04696580fa60 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -12897,6 +12897,7 @@ rs6000_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
 
       tree copy = build_call_expr (builtin_decl_implicit (BUILT_IN_MEMCPY),
 				   3, dest_addr, addr, size_int (rsize * 4));
+      TREE_ADDRESSABLE (tmp) = 1;
 
       gimplify_and_add (copy, pre_p);
       addr = dest_addr;
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 033d1458dfcb..69ab82d64ca4 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,6 +1,11 @@
 2018-06-25  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from mainline
+	2018-03-09  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/84772
+	* gcc.dg/pr84772.c: New test.
+
 	2018-03-09  Jason Merrill  <jason@redhat.com>
 		    Jakub Jelinek  <jakub@redhat.com>
 
diff --git a/gcc/testsuite/gcc.dg/pr84772.c b/gcc/testsuite/gcc.dg/pr84772.c
new file mode 100644
index 000000000000..1241d2123501
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr84772.c
@@ -0,0 +1,13 @@
+/* PR target/84772 */
+/* { dg-do compile } */
+/* { dg-options "-O -Wuninitialized" } */
+
+#include <stdarg.h>
+
+void
+foo (int *x, int y, va_list ap)
+{
+  __builtin_memset (x, 0, sizeof (int));
+  for (int i = 0; i < y; i++)
+    va_arg (ap, long double);			/* { dg-bogus "uninitialized" } */  
+}