llvm/llvm/test/CodeGen/AArch64/gpr_cttz.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -verify-machineinstrs -o - %s -mtriple=aarch64-linux-gnu | FileCheck %s
; RUN: llc -verify-machineinstrs -o - %s -mtriple=aarch64-linux-gnu -mattr=+cssc | FileCheck %s -check-prefix=CHECK-CSSC

define i4 @cttz4(i4 %x) {
; CHECK-LABEL: cttz4:
; CHECK:       // %bb.0:
; CHECK-NEXT:    orr w8, w0, #0x10
; CHECK-NEXT:    rbit w8, w8
; CHECK-NEXT:    clz w0, w8
; CHECK-NEXT:    ret
;
; CHECK-CSSC-LABEL: cttz4:
; CHECK-CSSC:       // %bb.0:
; CHECK-CSSC-NEXT:    orr w8, w0, #0x10
; CHECK-CSSC-NEXT:    ctz w0, w8
; CHECK-CSSC-NEXT:    ret
  %ctz = tail call i4 @llvm.cttz.i4(i4 %x)
  ret i4 %ctz
}

define i8 @cttz8(i8 %x) {
; CHECK-LABEL: cttz8:
; CHECK:       // %bb.0:
; CHECK-NEXT:    orr w8, w0, #0x100
; CHECK-NEXT:    rbit w8, w8
; CHECK-NEXT:    clz w0, w8
; CHECK-NEXT:    ret
;
; CHECK-CSSC-LABEL: cttz8:
; CHECK-CSSC:       // %bb.0:
; CHECK-CSSC-NEXT:    orr w8, w0, #0x100
; CHECK-CSSC-NEXT:    ctz w0, w8
; CHECK-CSSC-NEXT:    ret
  %ctz = tail call i8 @llvm.cttz.i8(i8 %x)
  ret i8 %ctz
}

define i16 @cttz16(i16 %x) {
; CHECK-LABEL: cttz16:
; CHECK:       // %bb.0:
; CHECK-NEXT:    orr w8, w0, #0x10000
; CHECK-NEXT:    rbit w8, w8
; CHECK-NEXT:    clz w0, w8
; CHECK-NEXT:    ret
;
; CHECK-CSSC-LABEL: cttz16:
; CHECK-CSSC:       // %bb.0:
; CHECK-CSSC-NEXT:    orr w8, w0, #0x10000
; CHECK-CSSC-NEXT:    ctz w0, w8
; CHECK-CSSC-NEXT:    ret
  %ctz = tail call i16 @llvm.cttz.i16(i16 %x)
  ret i16 %ctz
}

define i17 @cttz17(i17 %x) {
; CHECK-LABEL: cttz17:
; CHECK:       // %bb.0:
; CHECK-NEXT:    orr w8, w0, #0x20000
; CHECK-NEXT:    rbit w8, w8
; CHECK-NEXT:    clz w0, w8
; CHECK-NEXT:    ret
;
; CHECK-CSSC-LABEL: cttz17:
; CHECK-CSSC:       // %bb.0:
; CHECK-CSSC-NEXT:    orr w8, w0, #0x20000
; CHECK-CSSC-NEXT:    ctz w0, w8
; CHECK-CSSC-NEXT:    ret
  %ctz = tail call i17 @llvm.cttz.i17(i17 %x)
  ret i17 %ctz
}

define i32 @cttz32(i32 %x) nounwind readnone {
; CHECK-LABEL: cttz32:
; CHECK:       // %bb.0:
; CHECK-NEXT:    rbit w8, w0
; CHECK-NEXT:    clz w0, w8
; CHECK-NEXT:    ret
;
; CHECK-CSSC-LABEL: cttz32:
; CHECK-CSSC:       // %bb.0:
; CHECK-CSSC-NEXT:    ctz w0, w0
; CHECK-CSSC-NEXT:    ret
  %ctz = tail call i32 @llvm.cttz.i32(i32 %x)
  ret i32 %ctz
}

define i64 @cttz64(i64 %x) nounwind readnone {
; CHECK-LABEL: cttz64:
; CHECK:       // %bb.0:
; CHECK-NEXT:    rbit x8, x0
; CHECK-NEXT:    clz x0, x8
; CHECK-NEXT:    ret
;
; CHECK-CSSC-LABEL: cttz64:
; CHECK-CSSC:       // %bb.0:
; CHECK-CSSC-NEXT:    ctz x0, x0
; CHECK-CSSC-NEXT:    ret
  %ctz = tail call i64 @llvm.cttz.i64(i64 %x)
  ret i64 %ctz
}

define i128 @cttz128(i128 %x) nounwind readnone {
; CHECK-LABEL: cttz128:
; CHECK:       // %bb.0:
; CHECK-NEXT:    rbit x8, x1
; CHECK-NEXT:    rbit x9, x0
; CHECK-NEXT:    cmp x0, #0
; CHECK-NEXT:    mov x1, xzr
; CHECK-NEXT:    clz x8, x8
; CHECK-NEXT:    clz x9, x9
; CHECK-NEXT:    add x8, x8, #64
; CHECK-NEXT:    csel x0, x9, x8, ne
; CHECK-NEXT:    ret
;
; CHECK-CSSC-LABEL: cttz128:
; CHECK-CSSC:       // %bb.0:
; CHECK-CSSC-NEXT:    ctz x8, x1
; CHECK-CSSC-NEXT:    ctz x9, x0
; CHECK-CSSC-NEXT:    cmp x0, #0
; CHECK-CSSC-NEXT:    add x8, x8, #64
; CHECK-CSSC-NEXT:    mov x1, xzr
; CHECK-CSSC-NEXT:    csel x0, x9, x8, ne
; CHECK-CSSC-NEXT:    ret
  %ctz = tail call i128 @llvm.cttz.i128(i128 %x)
  ret i128 %ctz
}

define i32 @cttz32combine(i32 %x) nounwind readnone {
; CHECK-LABEL: cttz32combine:
; CHECK:       // %bb.0:
; CHECK-NEXT:    rbit w8, w0
; CHECK-NEXT:    clz w0, w8
; CHECK-NEXT:    ret
;
; CHECK-CSSC-LABEL: cttz32combine:
; CHECK-CSSC:       // %bb.0:
; CHECK-CSSC-NEXT:    ctz w0, w0
; CHECK-CSSC-NEXT:    ret
  %rev = tail call i32 @llvm.bitreverse.i32(i32 %x)
  %ctz = tail call i32 @llvm.ctlz.i32(i32 %rev)
  ret i32 %ctz
}

define i64 @cttz64combine(i64 %x) nounwind readnone {
; CHECK-LABEL: cttz64combine:
; CHECK:       // %bb.0:
; CHECK-NEXT:    rbit x8, x0
; CHECK-NEXT:    clz x0, x8
; CHECK-NEXT:    ret
;
; CHECK-CSSC-LABEL: cttz64combine:
; CHECK-CSSC:       // %bb.0:
; CHECK-CSSC-NEXT:    ctz x0, x0
; CHECK-CSSC-NEXT:    ret
  %rev = tail call i64 @llvm.bitreverse.i64(i64 %x)
  %ctz = tail call i64 @llvm.ctlz.i64(i64 %rev)
  ret i64 %ctz
}

declare i4 @llvm.cttz.i4(i4 %x) nounwind readnone
declare i8 @llvm.cttz.i8(i8 %x) nounwind readnone
declare i16 @llvm.cttz.i16(i16 %x) nounwind readnone
declare i17 @llvm.cttz.i17(i17 %x) nounwind readnone
declare i32 @llvm.cttz.i32(i32) nounwind readnone
declare i64 @llvm.cttz.i64(i64) nounwind readnone
declare i128 @llvm.cttz.i128(i128) nounwind readnone

declare i32 @llvm.ctlz.i32(i32 %x) nounwind readnone
declare i32 @llvm.bitreverse.i32(i32 %x) nounwind readnone
declare i64 @llvm.ctlz.i64(i64 %x) nounwind readnone
declare i64 @llvm.bitreverse.i64(i64 %x) nounwind readnone