1 files changed, 31 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/DirectX/reversebits.ll b/llvm/test/CodeGen/DirectX/reversebits.ll
new file mode 100644
index 000000000000..b6a7a1bc6152
--- /dev/null
+++ b/llvm/test/CodeGen/DirectX/reversebits.ll
@@ -0,0 +1,31 @@
+; RUN: opt -S -dxil-op-lower < %s | FileCheck %s
+
+; Make sure dxil operation function calls for reversebits are generated for all integer types.
+
+; Function Attrs: nounwind
+define noundef i16 @test_bitreverse_short(i16 noundef %a) {
+entry:
+; CHECK:call i16 @dx.op.unary.i16(i32 30, i16 %{{.*}})
+  %elt.bitreverse = call i16 @llvm.bitreverse.i16(i16 %a)
+  ret i16 %elt.bitreverse
+}
+
+; Function Attrs: nounwind
+define noundef i32 @test_bitreverse_int(i32 noundef %a) {
+entry:
+; CHECK:call i32 @dx.op.unary.i32(i32 30, i32 %{{.*}})
+  %elt.bitreverse = call i32 @llvm.bitreverse.i32(i32 %a)
+  ret i32 %elt.bitreverse
+}
+
+; Function Attrs: nounwind
+define noundef i64 @test_bitreverse_long(i64 noundef %a) {
+entry:
+; CHECK:call i64 @dx.op.unary.i64(i32 30, i64 %{{.*}})
+  %elt.bitreverse = call i64 @llvm.bitreverse.i64(i64 %a)
+  ret i64 %elt.bitreverse
+}
+
+declare i16 @llvm.bitreverse.i16(i16)
+declare i32 @llvm.bitreverse.i32(i32)
+declare i64 @llvm.bitreverse.i64(i64)