rot.ll
1.05 KB
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; 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
}