1; RUN: llc < %s -mtriple=avr | FileCheck %s 2 3define i8 @count_leading_zeros(i8) unnamed_addr { 4entry-block: 5 %1 = tail call i8 @llvm.ctlz.i8(i8 %0) 6 ret i8 %1 7} 8 9declare i8 @llvm.ctlz.i8(i8) 10 11; CHECK-LABEL: count_leading_zeros: 12; CHECK: cpi [[RESULT:r[0-9]+]], 0 13; CHECK: breq .LBB0_2 14; CHECK: mov [[SCRATCH:r[0-9]+]], {{.*}}[[RESULT]] 15; CHECK: lsr {{.*}}[[SCRATCH]] 16; CHECK: or {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] 17; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] 18; CHECK: lsr {{.*}}[[RESULT]] 19; CHECK: lsr {{.*}}[[RESULT]] 20; CHECK: or {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] 21; CHECK: mov {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] 22; CHECK: swap {{.*}}[[SCRATCH]] 23; CHECK: andi {{.*}}[[SCRATCH]], 15 24; CHECK: or {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] 25; CHECK: com {{.*}}[[SCRATCH]] 26; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] 27; CHECK: lsr {{.*}}[[RESULT]] 28; CHECK: andi {{.*}}[[RESULT]], 85 29; CHECK: sub {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] 30; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] 31; CHECK: andi {{.*}}[[RESULT]], 51 32; CHECK: lsr {{.*}}[[SCRATCH]] 33; CHECK: lsr {{.*}}[[SCRATCH]] 34; CHECK: andi {{.*}}[[SCRATCH]], 51 35; CHECK: add {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] 36; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] 37; CHECK: swap {{.*}}[[RESULT]] 38; CHECK: add {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] 39; CHECK: andi {{.*}}[[RESULT]], 15 40; CHECK: ret 41; CHECK: LBB0_2: 42; CHECK: ldi {{.*}}[[RESULT]], 8 43; CHECK: ret 44