--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.target/i386/pr92658-avx512bw-trunc.c	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,91 @@
+/* PR target/92658 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize -mavx512bw -mavx512vl" } */
+
+typedef unsigned char v8qi __attribute__((vector_size (8)));
+typedef unsigned char v16qi __attribute__((vector_size (16)));
+typedef unsigned char v32qi __attribute__((vector_size (32)));
+typedef unsigned short v8hi __attribute__((vector_size (16)));
+typedef unsigned short v16hi __attribute__((vector_size (32)));
+typedef unsigned short v32hi __attribute__((vector_size (64)));
+
+
+void
+truncwb_512 (v32qi * dst, v32hi * __restrict src)
+{
+  unsigned char tem[8];
+  tem[0] = (*src)[0];
+  tem[1] = (*src)[1];
+  tem[2] = (*src)[2];
+  tem[3] = (*src)[3];
+  tem[4] = (*src)[4];
+  tem[5] = (*src)[5];
+  tem[6] = (*src)[6];
+  tem[7] = (*src)[7];
+  tem[8] = (*src)[8];
+  tem[9] = (*src)[9];
+  tem[10] = (*src)[10];
+  tem[11] = (*src)[11];
+  tem[12] = (*src)[12];
+  tem[13] = (*src)[13];
+  tem[14] = (*src)[14];
+  tem[15] = (*src)[15];
+  tem[16] = (*src)[16];
+  tem[17] = (*src)[17];
+  tem[18] = (*src)[18];
+  tem[19] = (*src)[19];
+  tem[20] = (*src)[20];
+  tem[21] = (*src)[21];
+  tem[22] = (*src)[22];
+  tem[23] = (*src)[23];
+  tem[24] = (*src)[24];
+  tem[25] = (*src)[25];
+  tem[26] = (*src)[26];
+  tem[27] = (*src)[27];
+  tem[28] = (*src)[28];
+  tem[29] = (*src)[29];
+  tem[30] = (*src)[30];
+  tem[31] = (*src)[31];
+  dst[0] = *(v32qi *) tem;
+}
+
+void
+truncwb_256 (v16qi * dst, v16hi * __restrict src)
+{
+  unsigned char tem[8];
+  tem[0] = (*src)[0];
+  tem[1] = (*src)[1];
+  tem[2] = (*src)[2];
+  tem[3] = (*src)[3];
+  tem[4] = (*src)[4];
+  tem[5] = (*src)[5];
+  tem[6] = (*src)[6];
+  tem[7] = (*src)[7];
+  tem[8] = (*src)[8];
+  tem[9] = (*src)[9];
+  tem[10] = (*src)[10];
+  tem[11] = (*src)[11];
+  tem[12] = (*src)[12];
+  tem[13] = (*src)[13];
+  tem[14] = (*src)[14];
+  tem[15] = (*src)[15];
+  dst[0] = *(v16qi *) tem;
+}
+
+void
+truncwb_128 (v16qi * dst, v8hi * __restrict src)
+{
+  unsigned char tem[8];
+  tem[0] = (*src)[0];
+  tem[1] = (*src)[1];
+  tem[2] = (*src)[2];
+  tem[3] = (*src)[3];
+  tem[4] = (*src)[4];
+  tem[5] = (*src)[5];
+  tem[6] = (*src)[6];
+  tem[7] = (*src)[7];
+  dst[0] = *(v16qi *) tem;
+}
+
+/* { dg-final { scan-assembler-times "vpmovwb" 2 } } */
+/* { dg-final { scan-assembler-times "vpmovwb" 3 { xfail *-*-* } } } */