re PR rtl-optimization/83682 (ICE in simplify_subreg, at simplify-rtx.c:6296)

	PR rtl-optimization/83682
	* rtl.h (const_vec_duplicate_p): Only return true for VEC_DUPLICATE
	if it has non-VECTOR_MODE element mode.
	(vec_duplicate_p): Likewise.

	* gcc.target/i386/pr83682.c: New test.

From-SVN: r256308

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 51f92bcf0b08eaf43945c096b878a6a891621065..283f792dcf7b889076ba468accb6c62cbf9d9651 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2018-01-06  Jakub Jelinek  <jakub@redhat.com>
 
+       PR rtl-optimization/83682
+       * rtl.h (const_vec_duplicate_p): Only return true for VEC_DUPLICATE
+       if it has non-VECTOR_MODE element mode.
+       (vec_duplicate_p): Likewise.
+
        PR middle-end/83694
        * cfgexpand.c (expand_debug_expr): Punt if mode1 is VOIDmode
        and bitsize might be greater than MAX_BITSIZE_MODE_ANY_INT.

diff --git a/gcc/rtl.h b/gcc/rtl.h
index 224dc966332af816a4e7cfd490e2e2bcd6a73064..71a81a211f185e5ee8a719e3ba7931874f34c8f7 100644 (file)
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -2969,7 +2969,9 @@ const_vec_duplicate_p (T x, T *elt)
       *elt = CONST_VECTOR_ENCODED_ELT (x, 0);
       return true;
     }
-  if (GET_CODE (x) == CONST && GET_CODE (XEXP (x, 0)) == VEC_DUPLICATE)
+  if (GET_CODE (x) == CONST
+      && GET_CODE (XEXP (x, 0)) == VEC_DUPLICATE
+      && !VECTOR_MODE_P (GET_MODE (XEXP (XEXP (x, 0), 0))))
     {
       *elt = XEXP (XEXP (x, 0), 0);
       return true;
@@ -2984,7 +2986,8 @@ template <typename T>
 inline bool
 vec_duplicate_p (T x, T *elt)
 {
-  if (GET_CODE (x) == VEC_DUPLICATE)
+  if (GET_CODE (x) == VEC_DUPLICATE
+      && !VECTOR_MODE_P (GET_MODE (XEXP (x, 0))))
     {
       *elt = XEXP (x, 0);
       return true;

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 1d3603a34f9cc834c988fd7cc8f05509ab902a38..7ebe12992e574b83942f6f8962c873fceadb601e 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-01-06  Jakub Jelinek  <jakub@redhat.com>
+
+       PR rtl-optimization/83682
+       * gcc.target/i386/pr83682.c: New test.
+
 2018-01-05  Janne Blomqvist  <jb@gcc.gnu.org>
 
        PR fortran/78534

diff --git a/gcc/testsuite/gcc.target/i386/pr83682.c b/gcc/testsuite/gcc.target/i386/pr83682.c
new file mode 100644 (file)
index 0000000..cbb61ff
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr83682.c
@@ -0,0 +1,17 @@
+/* PR rtl-optimization/83682 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -msse2" } */
+
+typedef float V __attribute__((__vector_size__(16)));
+typedef double W __attribute__((__vector_size__(16)));
+V b;
+W c;
+
+void
+foo (void *p)
+{
+  V e = __builtin_ia32_cvtsd2ss (b, c);
+  V g = e;
+  float f = g[0];
+  __builtin_memcpy (p, &f, sizeof (f));
+}