re PR target/84786 ([miscompilation] vunpcklpd accessing xmm16-22 targeting KNL)

	PR target/84786
	* config/i386/sse.md (vshift_count): New mode attr.
	(<shift_insn><mode>3<mask_name>): Use <vshift_count>N instead of vN
	as last operand's constraint for VI2_AVX2_AVX512BW shifts.  Use YvN
	instead of vN as last operand's constraint for VI48_AVX2 shifts.

	* gcc.target/i386/avx512f-pr84786-3.c: New test.

From-SVN: r262015

gcc/testsuite/ChangeLog

+2018-06-25  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/84786
+	* gcc.target/i386/avx512f-pr84786-3.c: New test.
+
 2018-06-25  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
 	* gnat.dg/sso9.adb: New testcase.

gcc/testsuite/gcc.target/i386/avx512f-pr84786-3.c

+/* PR target/84786 */
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-options "-mavx512f -mno-avx512vl -O2" } */
+
+#include <x86intrin.h>
+
+__m512i v;
+__m128i w;
+
+__m128i
+foo (__m128i x, int y)
+{
+  __m128i z;
+#define A(n) register __m512i zmm##n __asm ("zmm" #n);
+#define B A(1) A(2) A(3) A(4) A(5) A(6) A(7) \
+	  A(8) A(9) A(10) A(11) A(12) A(13) A(14)
+  B
+#undef A
+#define A(n) asm volatile ("" : "=v" (zmm##n) : "0" (v));
+  B
+  asm volatile ("" : "=x" (z) : "0" (w));
+  x = _mm_srli_epi16 (x, y);
+  asm volatile ("" : : "x" (z));
+#undef A
+#define A(n) asm volatile ("" : : "v" (zmm##n));
+  B
+  return x;
+}
+
+__m256i
+bar (__m256i x, int y)
+{
+  __m128i z;
+#undef A
+#define A(n) register __m512i zmm##n __asm ("zmm" #n);
+  B
+#undef A
+#define A(n) asm volatile ("" : "=v" (zmm##n) : "0" (v));
+  B
+  asm volatile ("" : "=x" (z) : "0" (w));
+  x = _mm256_slli_epi16 (x, y);
+  asm volatile ("" : : "x" (z));
+#undef A
+#define A(n) asm volatile ("" : : "v" (zmm##n));
+  B
+  return x;
+}
+
+/* { dg-final { scan-assembler-not "vpsrlw\[\^\n\r]*xmm(1\[6-9]|\[23]\[0-9])" } } */
+/* { dg-final { scan-assembler-not "vpsllw\[\^\n\r]*xmm(1\[6-9]|\[23]\[0-9])" } } */