re PR rtl-optimization/71984 (wrong code with -O -mavx512cd)

2016-07-26  Richard Biener  <rguenther@suse.de>

	PR rtl-optimization/71984
	* simplify-rtx.c (simplify_subreg): Use GET_MODE_SIZE and prepare
	for VOIDmode.

	* gcc.dg/torture/pr71984.c: New testcase.

From-SVN: r238757

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dff649d567981c6ea25a03029580e00e16dcdbff..6c9a3b668e64036194a223795d9e9ef155f5dd2d 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-07-26  Richard Biener  <rguenther@suse.de>
+
+       PR rtl-optimization/71984
+       * simplify-rtx.c (simplify_subreg): Use GET_MODE_SIZE and prepare
+       for VOIDmode.
+
 2016-07-26  Richard Biener  <rguenther@suse.de>
 
        PR middle-end/72517

diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index c34f2f5562324c6191a6ab21dcb6d52e996ada4c..691c2c1b6782e6b2462e37d12498f8f7abb33def 100644 (file)
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -6116,7 +6116,10 @@ simplify_subreg (machine_mode outermode, rtx op,
       unsigned int part_size, final_offset;
       rtx part, res;
 
-      part_size = GET_MODE_UNIT_SIZE (GET_MODE (XEXP (op, 0)));
+      enum machine_mode part_mode = GET_MODE (XEXP (op, 0));
+      if (part_mode == VOIDmode)
+       part_mode = GET_MODE_INNER (GET_MODE (op));
+      part_size = GET_MODE_SIZE (part_mode);
       if (byte < part_size)
        {
          part = XEXP (op, 0);
@@ -6131,7 +6134,7 @@ simplify_subreg (machine_mode outermode, rtx op,
       if (final_offset + GET_MODE_SIZE (outermode) > part_size)
        return NULL_RTX;
 
-      enum machine_mode part_mode = GET_MODE (part);
+      part_mode = GET_MODE (part);
       if (part_mode == VOIDmode)
        part_mode = GET_MODE_INNER (GET_MODE (op));
       res = simplify_subreg (outermode, part, part_mode, final_offset);

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 5307adfcb9728760104043be74cce71b7417cdbc..71d0d84f8cd2a32f2ce0c3c42f3416dc2539a9d5 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-07-26  Richard Biener  <rguenther@suse.de>
+
+       PR rtl-optimization/71984
+       * gcc.dg/torture/pr71984.c: New testcase.
+
 2016-07-26  Robert Suchanek  <robert.suchanek@imgtec.com>
 
        * g++.dg/vect/vect.exp: Add and set new global EFFECTIVE_TARGETS. Call

diff --git a/gcc/testsuite/gcc.dg/torture/pr71984.c b/gcc/testsuite/gcc.dg/torture/pr71984.c
new file mode 100644 (file)
index 0000000..e1dd04b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr71984.c
@@ -0,0 +1,21 @@
+/* { dg-do run { target lp64 } } */
+/* { dg-additional-options "-w -Wno-psabi" } */
+
+typedef unsigned char v64u8 __attribute__((vector_size(64)));
+typedef unsigned long v64u64 __attribute__((vector_size(64)));
+typedef unsigned char u8;
+
+static u8 __attribute__ ((noinline, noclone))
+foo (v64u64 v64u64_0)
+{
+  return ((v64u8)(v64u64){0, v64u64_0[0]})[13];
+}
+
+int
+main ()
+{
+  u8 x = foo((v64u64){0x0706050403020100UL});
+  if (x != 5)
+    __builtin_abort ();
+  return 0;
+}