From 8c6b5eb80f51aa685b1d86305399d4dc22300ec2 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Mon, 5 Mar 2018 17:01:03 +0100
Subject: [PATCH] re PR target/84524 (-O3 causes behavior change)

	PR target/84524
	* config/i386/sse.md (*<code><mode>3): Replace <mask_prefix3> with
	orig,vex.
	(*<plusminus_insn><mode>3): Likewise.  Remove <mask_operand3> uses.

	* gcc.c-torture/execute/pr84524.c: New test.
	* gcc.target/i386/avx512bw-pr84524.c: New test.

From-SVN: r258252
---
 gcc/ChangeLog                                 |  7 ++++
 gcc/config/i386/sse.md                        |  6 +--
 gcc/testsuite/ChangeLog                       |  6 +++
 gcc/testsuite/gcc.c-torture/execute/pr84524.c | 41 +++++++++++++++++++
 .../gcc.target/i386/avx512bw-pr84524.c        | 14 +++++++
 5 files changed, 71 insertions(+), 3 deletions(-)
 create mode 100644 gcc/testsuite/gcc.c-torture/execute/pr84524.c
 create mode 100644 gcc/testsuite/gcc.target/i386/avx512bw-pr84524.c

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 723e718baa1..ef9a8c95f71 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-03-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/84524
+	* config/i386/sse.md (*<code><mode>3): Replace <mask_prefix3> with
+	orig,vex.
+	(*<plusminus_insn><mode>3): Likewise.  Remove <mask_operand3> uses.
+
 2018-03-05  Peter Bergner  <bergner@vnet.ibm.com>
 
 	PR target/84264
diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index 26c4f5227f6..12a594f78bf 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -10090,11 +10090,11 @@
   "TARGET_SSE2 && ix86_binary_operator_ok (<CODE>, <MODE>mode, operands)"
   "@
    p<plusminus_mnemonic><ssemodesuffix>\t{%2, %0|%0, %2}
-   vp<plusminus_mnemonic><ssemodesuffix>\t{%2, %1, %0<mask_operand3>|%0<mask_operand3>, %1, %2}"
+   vp<plusminus_mnemonic><ssemodesuffix>\t{%2, %1, %0|%0, %1, %2}"
   [(set_attr "isa" "noavx,avx")
    (set_attr "type" "sseiadd")
    (set_attr "prefix_data16" "1,*")
-   (set_attr "prefix" "<mask_prefix3>")
+   (set_attr "prefix" "orig,vex")
    (set_attr "mode" "<sseinsnmode>")])
 
 (define_insn "*<plusminus_insn><mode>3_mask"
@@ -11899,7 +11899,7 @@
 	    (eq_attr "mode" "TI"))
        (const_string "1")
        (const_string "*")))
-   (set_attr "prefix" "<mask_prefix3>,evex")
+   (set_attr "prefix" "orig,vex,evex")
    (set (attr "mode")
 	(cond [(and (match_test "<MODE_SIZE> == 16")
 		    (match_test "TARGET_SSE_PACKED_SINGLE_INSN_OPTIMAL"))
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 70bce764b06..6195e215a9e 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2018-03-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/84524
+	* gcc.c-torture/execute/pr84524.c: New test.
+	* gcc.target/i386/avx512bw-pr84524.c: New test.
+
 2018-03-05  Peter Bergner  <bergner@vnet.ibm.com>
 
 	PR target/84264
diff --git a/gcc/testsuite/gcc.c-torture/execute/pr84524.c b/gcc/testsuite/gcc.c-torture/execute/pr84524.c
new file mode 100644
index 00000000000..8ca07153fb4
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/pr84524.c
@@ -0,0 +1,41 @@
+/* PR target/84524 */
+
+__attribute__((noipa)) void
+foo (unsigned short *x)
+{
+  unsigned short i, v;
+  unsigned char j;
+  for (i = 0; i < 256; i++)
+    {
+      v = i << 8;
+      for (j = 0; j < 8; j++)
+	if (v & 0x8000)
+	  v = (v << 1) ^ 0x1021;
+	else
+	  v = v << 1;
+      x[i] = v;
+    }
+}
+
+int
+main ()
+{
+  unsigned short a[256];
+
+  foo (a);
+  for (int i = 0; i < 256; i++)
+    {
+      unsigned short v = i << 8;
+      for (int j = 0; j < 8; j++)
+	{
+	  asm volatile ("" : "+r" (v));
+	  if (v & 0x8000)
+	    v = (v << 1) ^ 0x1021;
+	  else
+	    v = v << 1;
+	}
+      if (a[i] != v)
+	__builtin_abort ();
+    }
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/i386/avx512bw-pr84524.c b/gcc/testsuite/gcc.target/i386/avx512bw-pr84524.c
new file mode 100644
index 00000000000..536e81e17db
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/avx512bw-pr84524.c
@@ -0,0 +1,14 @@
+/* PR target/84524 */
+/* { dg-do run { target avx512bw } } */
+/* { dg-options "-O3 -mavx512bw" } */
+
+#include "avx512bw-check.h"
+
+#define main() do_main()
+#include "../../gcc.c-torture/execute/pr84524.c"
+
+static void
+avx512bw_test (void)
+{
+  do_main ();
+}
-- 
2.30.2