[ARM] Add patterns for bitreverse intrinsic on MVE
BITREVERSE can use the VBRSR which will reverse and right shift.
Shifting right by 0 will just reverse the bits.
llvm-svn: 372001
diff --git a/llvm/test/CodeGen/Thumb2/mve-bitreverse.ll b/llvm/test/CodeGen/Thumb2/mve-bitreverse.ll
new file mode 100644
index 0000000..99f9506
--- /dev/null
+++ b/llvm/test/CodeGen/Thumb2/mve-bitreverse.ll
@@ -0,0 +1,52 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi -verify-machineinstrs -mattr=+mve %s -o - | FileCheck %s
+
+define arm_aapcs_vfpcc <2 x i64> @brv_2i64_t(<2 x i64> %src){
+; CHECK-LABEL: brv_2i64_t:
+; CHECK: @ %bb.0: @ %entry
+; CHECK-NEXT: vrev64.8 q1, q0
+; CHECK-NEXT: movs r0, #8
+; CHECK-NEXT: vbrsr.8 q0, q1, r0
+; CHECK-NEXT: bx lr
+entry:
+ %0 = call <2 x i64> @llvm.bitreverse.v2i64(<2 x i64> %src)
+ ret <2 x i64> %0
+}
+
+define arm_aapcs_vfpcc <4 x i32> @brv_4i32_t(<4 x i32> %src){
+; CHECK-LABEL: brv_4i32_t:
+; CHECK: @ %bb.0: @ %entry
+; CHECK-NEXT: movs r0, #32
+; CHECK-NEXT: vbrsr.32 q0, q0, r0
+; CHECK-NEXT: bx lr
+entry:
+ %0 = call <4 x i32> @llvm.bitreverse.v4i32(<4 x i32> %src)
+ ret <4 x i32> %0
+}
+
+define arm_aapcs_vfpcc <8 x i16> @brv_8i16_t(<8 x i16> %src){
+; CHECK-LABEL: brv_8i16_t:
+; CHECK: @ %bb.0: @ %entry
+; CHECK-NEXT: movs r0, #16
+; CHECK-NEXT: vbrsr.16 q0, q0, r0
+; CHECK-NEXT: bx lr
+entry:
+ %0 = call <8 x i16> @llvm.bitreverse.v8i16(<8 x i16> %src)
+ ret <8 x i16> %0
+}
+
+define arm_aapcs_vfpcc <16 x i8> @brv_16i8_t(<16 x i8> %src){
+; CHECK-LABEL: brv_16i8_t:
+; CHECK: @ %bb.0: @ %entry
+; CHECK-NEXT: movs r0, #8
+; CHECK-NEXT: vbrsr.8 q0, q0, r0
+; CHECK-NEXT: bx lr
+entry:
+ %0 = call <16 x i8> @llvm.bitreverse.v16i8(<16 x i8> %src)
+ ret <16 x i8> %0
+}
+
+declare <2 x i64> @llvm.bitreverse.v2i64(<2 x i64>)
+declare <4 x i32> @llvm.bitreverse.v4i32(<4 x i32>)
+declare <8 x i16> @llvm.bitreverse.v8i16(<8 x i16>)
+declare <16 x i8> @llvm.bitreverse.v16i8(<16 x i8>)