llvm/test/CodeGen/AVR/rot.ll

; RUN: llc < %s -march=avr | FileCheck %s

; Bit rotation tests.

; CHECK-LABEL: rol8:
define i8 @rol8(i8 %val, i8 %amt) {
  ; CHECK:      andi r22, 7

  ; CHECK-NEXT: cpi r22, 0
  ; CHECK-NEXT: breq .LBB0_2

; CHECK-NEXT: .LBB0_1:
  ; CHECK-NEXT: lsl r24
  ; CHECK-NEXT: adc r24, r1
  ; CHECK-NEXT: subi r22, 1
  ; CHECK-NEXT: brne .LBB0_1

; CHECK-NEXT: .LBB0_2:
  ; CHECK-NEXT: ret
  %mod = urem i8 %amt, 8

  %inv = sub i8 8, %mod
  %parta = shl i8 %val, %mod
  %partb = lshr i8 %val, %inv

  %rotl = or i8 %parta, %partb

  ret i8 %rotl
}


; CHECK-LABEL: ror8:
define i8 @ror8(i8 %val, i8 %amt) {
  ; CHECK:      andi r22, 7

  ; CHECK-NEXT: cpi r22, 0
  ; CHECK-NEXT: breq .LBB1_2

; CHECK-NEXT: .LBB1_1:
  ; CHECK-NEXT: lsr r24
  ; CHECK-NEXT: ldi r0, 0
  ; CHECK-NEXT: ror r0
  ; CHECK-NEXT: or r24, r0
  ; CHECK-NEXT: subi r22, 1
  ; CHECK-NEXT: brne .LBB1_1

; CHECK-NEXT: .LBB1_2:
  ; CHECK-NEXT: ret
  %mod = urem i8 %amt, 8

  %inv = sub i8 8, %mod
  %parta = lshr i8 %val, %mod
  %partb = shl i8 %val, %inv

  %rotr = or i8 %parta, %partb

  ret i8 %rotr
}