blob: b1ef34acf6315867bf833b0794e8a104f8365c52 [file] [log] [blame]
; RUN: llc < %s -march=avr | FileCheck %s
define i8 @count_trailing_zeros(i8) unnamed_addr {
entry-block:
%1 = tail call i8 @llvm.cttz.i8(i8 %0)
ret i8 %1
}
declare i8 @llvm.cttz.i8(i8)
; CHECK-LABEL: count_trailing_zeros:
; CHECK: cpi [[RESULT:r[0-9]+]], 0
; CHECK: breq [[END_BB:.LBB[0-9]+_[0-9]+]]
; CHECK: mov [[SCRATCH:r[0-9]+]], {{.*}}[[RESULT]]
; CHECK: dec {{.*}}[[SCRATCH]]
; CHECK: com {{.*}}[[RESULT]]
; CHECK: and {{.*}}[[RESULT]], {{.*}}[[SCRATCH]]
; CHECK: mov {{.*}}[[SCRATCH]], {{.*}}[[RESULT]]
; CHECK: lsr {{.*}}[[SCRATCH]]
; CHECK: andi {{.*}}[[SCRATCH]], 85
; CHECK: sub {{.*}}[[RESULT]], {{.*}}[[SCRATCH]]
; CHECK: mov {{.*}}[[SCRATCH]], {{.*}}[[RESULT]]
; CHECK: andi {{.*}}[[SCRATCH]], 51
; CHECK: lsr {{.*}}[[RESULT]]
; CHECK: lsr {{.*}}[[RESULT]]
; CHECK: andi {{.*}}[[RESULT]], 51
; CHECK: add {{.*}}[[RESULT]], {{.*}}[[SCRATCH]]
; CHECK: mov {{.*}}[[SCRATCH]], {{.*}}[[RESULT]]
; CHECK: swap {{.*}}[[SCRATCH]]
; CHECK: add {{.*}}[[SCRATCH]], {{.*}}[[RESULT]]
; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]]
; CHECK: andi {{.*}}[[RESULT]], 15
; CHECK: ret
; CHECK: [[END_BB]]:
; CHECK: ldi {{.*}}[[RESULT]], 8
; CHECK: ret