re PR target/79127 (Error: invalid register for .seh_savexmm in matmul_i4.c)

	PR target/79127
	* acinclude.m4 (LIBGFOR_CHECK_AVX512F): Ensure the test clobbers
	some zmm16+ registers to verify they are handled by unwind info
	properly if needed.
	* configure: Regenerated.

From-SVN: r244636

libgfortran/ChangeLog

+2017-01-19  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/79127
+	* acinclude.m4 (LIBGFOR_CHECK_AVX512F): Ensure the test clobbers
+	some zmm16+ registers to verify they are handled by unwind info
+	properly if needed.
+	* configure: Regenerated.
+
 2017-01-17  Jakub Jelinek  <jakub@redhat.com>
 
 	PR other/79046

libgfortran/acinclude.m4

@@ -437,7 +437,14 @@ AC_DEFUN([LIBGFOR_CHECK_AVX512F], [
 	typedef double __m512d __attribute__ ((__vector_size__ (64)));
 	__m512d _mm512_add (__m512d a)
 	{
-	  return __builtin_ia32_addpd512_mask (a, a, a, 1, 4);
+	  __m512d b = __builtin_ia32_addpd512_mask (a, a, a, 1, 4);
+	  /* For -m64/-mx32 also verify that code will work even if
+	     the target uses call saved zmm16+ and needs to emit
+	     unwind info for them (e.g. on mingw).  See PR79127.  */
+#ifdef __x86_64__
+	  asm volatile ("" : : : "zmm16", "zmm17", "zmm18", "zmm19");
+#endif
+	  return b;
         }]], [[]])],
 	AC_DEFINE(HAVE_AVX512F, 1,
 	[Define if AVX512f instructions can be compiled.]),

libgfortran/configure

@@ -26300,7 +26300,14 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 	typedef double __m512d __attribute__ ((__vector_size__ (64)));
 	__m512d _mm512_add (__m512d a)
 	{
-	  return __builtin_ia32_addpd512_mask (a, a, a, 1, 4);
+	  __m512d b = __builtin_ia32_addpd512_mask (a, a, a, 1, 4);
+	  /* For -m64/-mx32 also verify that code will work even if
+	     the target uses call saved zmm16+ and needs to emit
+	     unwind info for them (e.g. on mingw).  See PR79127.  */
+#ifdef __x86_64__
+	  asm volatile ("" : : : "zmm16", "zmm17", "zmm18", "zmm19");
+#endif
+	  return b;
         }
 int
 main ()