[X86] Support intrinsic _mm_broadcastsi128_si256

Reviewers: LuoYuanke, craig.topper, RKSimon, pengfei

Reviewed By: craig.topper

Subscribers: cfe-commits, llvm-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D75897

Author: KanRobert

clang/lib/Headers/avx2intrin.h

@@ -740,6 +740,8 @@ _mm256_broadcastsi128_si256(__m128i __X)
   return (__m256i)__builtin_shufflevector((__v2di)__X, (__v2di)__X, 0, 1, 0, 1);
 }
 
+#define _mm_broadcastsi128_si256(X) _mm256_broadcastsi128_si256(X)
+
 #define _mm_blend_epi32(V1, V2, M) \
   (__m128i)__builtin_ia32_pblendd128((__v4si)(__m128i)(V1), \
                                      (__v4si)(__m128i)(V2), (int)(M))

clang/test/CodeGen/avx2-builtins.c

@@ -208,6 +208,12 @@ __m256i test_mm256_broadcastsi128_si256(__m128i a) {
   return _mm256_broadcastsi128_si256(a);
 }
 
+__m256i test_mm_broadcastsi128_si256(__m128i a) {
+  // CHECK-LABEL: test_mm_broadcastsi128_si256
+  // CHECK: shufflevector <2 x i64> %{{.*}}, <2 x i64> %{{.*}}, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
+  return _mm_broadcastsi128_si256(a);
+}
+
 __m128 test_mm_broadcastss_ps(__m128 a) {
   // CHECK-LABEL: test_mm_broadcastss_ps
   // CHECK-NOT: @llvm.x86.avx2.vbroadcast.ss.ps