From: Peter Bergner <bergner@linux.ibm.com>
Date: Thu, 20 Feb 2020 17:08:02 +0000 (-0600)
Subject: rs6000: Fix infinite loop building ghostscript and icu [PR93658]
X-Git-Tag: upstream/12.2.0~18272
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b82d426662469ee8b78ec7e8f74abe950485c9d5;p=platform%2Fupstream%2Fgcc.git

rs6000: Fix infinite loop building ghostscript and icu [PR93658]

Fix rs6000_legitimate_address_p(), which erroneously marks a valid Altivec
address as being invalid, which causes LRA's process_address()  to go into
an infinite loop spilling the same address over and over again.

gcc/
	PR target/93658
	* config/rs6000/rs6000.c (rs6000_legitimate_address_p): Handle VSX
	vector modes.

gcc/testsuite/
	PR target/93658
	* gcc.target/powerpc/pr93658.c: New test.
---

diff --git a/gcc/testsuite/gcc.target/powerpc/pr93658.c b/gcc/testsuite/gcc.target/powerpc/pr93658.c
new file mode 100644
index 0000000..0170d34
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr93658.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -fstack-protector-strong -mcpu=power8" } */
+/* { dg-require-effective-target powerpc_vsx_ok } */
+
+/* PR93658: Failure compiling this test is an infinite loop in LRA's
+   process_address(), so set a short timeout limit.  */
+/* { dg-timeout 5 } */
+
+void bar();
+char b;
+void
+foo (void)
+{
+  char a;
+  int d = b;
+  char *e = &a;
+  while (d)
+    *e++ = --d;
+  bar ();
+}