From: Jakub Jelinek <jakub@gcc.gnu.org>
Date: Thu, 14 Feb 2019 23:10:47 +0000 (+0100)
Subject: re PR rtl-optimization/89354 (Combine pass yields wrong code with -O2 and -msse2... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=dddd0c7a5b751f398cba325dc7310bb185fed201;p=gcc.git

re PR rtl-optimization/89354 (Combine pass yields wrong code with -O2 and -msse2 for 32bit target)

	PR rtl-optimization/89354
	* combine.c (make_extraction): Punt if extraction_mode is narrower
	than len bits.

	* gcc.dg/pr89354.c: New test.

From-SVN: r268913
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e2c7b8ef353..d3f97061393 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,6 +1,12 @@
+2019-02-14  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/89354
+	* combine.c (make_extraction): Punt if extraction_mode is narrower
+	than len bits.
+
 2019-02-14  Maya Rashish  <coypu@sdf.org>
 
-	* config.gcc (*-*-netbsd*): Add netbsd-d.o
+	* config.gcc (*-*-netbsd*): Add netbsd-d.o.
 	* config/netbsd-d.c: New file.
 	* config/t-netbsd: Add netbsd-d.o
 
diff --git a/gcc/combine.c b/gcc/combine.c
index a2492481693..91e32c88c88 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -7830,6 +7830,10 @@ make_extraction (machine_mode mode, rtx inner, HOST_WIDE_INT pos,
       && partial_subreg_p (extraction_mode, mode))
     extraction_mode = mode;
 
+  /* Punt if len is too large for extraction_mode.  */
+  if (maybe_gt (len, GET_MODE_PRECISION (extraction_mode)))
+    return NULL_RTX;
+
   if (!MEM_P (inner))
     wanted_inner_mode = wanted_inner_reg_mode;
   else
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index ae430692a12..a08f4013197 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-02-14  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/89354
+	* gcc.dg/pr89354.c: New test.
+
 2019-02-14  Uroš Bizjak  <ubizjak@gmail.com>
 
 	* gcc.target/i386/ssse3-pabsb.c: Re-enable 64-bit form on AVX targets.
diff --git a/gcc/testsuite/gcc.dg/pr89354.c b/gcc/testsuite/gcc.dg/pr89354.c
new file mode 100644
index 00000000000..0c58cc182eb
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr89354.c
@@ -0,0 +1,22 @@
+/* PR rtl-optimization/89354 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+/* { dg-additional-options "-msse2" { target sse2_runtime } } */
+
+static unsigned long long q = 0;
+
+__attribute__((noipa)) static void
+foo (void)
+{
+  q = (q & ~0x1ffffffffULL) | 0x100000000ULL;
+}
+
+int
+main ()
+{
+  __asm volatile ("" : "+m" (q));
+  foo ();
+  if (q != 0x100000000ULL)
+    __builtin_abort ();
+  return 0;
+}