Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

external/llvm/test/CodeGen/AArch64/rbit.ll

@@ -0,0 +1,42 @@
+; RUN: llc -mtriple=aarch64-eabi %s -o - | FileCheck %s
+
+; The llvm.aarch64.rbit intrinsic should be auto-upgraded to the
+; target-independent bitreverse intrinsic.
+
+; CHECK-LABEL: rbit32
+; CHECK: rbit w0, w0
+define i32 @rbit32(i32 %t) {
+entry:
+  %rbit.i = call i32 @llvm.aarch64.rbit.i32(i32 %t)
+  ret i32 %rbit.i
+}
+
+; CHECK-LABEL: rbit64
+; CHECK: rbit x0, x0
+define i64 @rbit64(i64 %t) {
+entry:
+  %rbit.i = call i64 @llvm.aarch64.rbit.i64(i64 %t)
+  ret i64 %rbit.i
+}
+
+declare i64 @llvm.aarch64.rbit.i64(i64)
+declare i32 @llvm.aarch64.rbit.i32(i32)
+
+; CHECK-LABEL: rbit_generic32
+; CHECK: rbit w0, w0
+define i32 @rbit_generic32(i32 %t) {
+entry:
+  %rbit = call i32 @llvm.bitreverse.i32(i32 %t)
+  ret i32 %rbit
+}
+
+; CHECK-LABEL: rbit_generic64
+; CHECK: rbit x0, x0
+define i64 @rbit_generic64(i64 %t) {
+entry:
+  %rbit = call i64 @llvm.bitreverse.i64(i64 %t)
+  ret i64 %rbit
+}
+
+declare i32 @llvm.bitreverse.i32(i32) readnone
+declare i64 @llvm.bitreverse.i64(i64) readnone