| ; RUN: llc < %s -march=avr | FileCheck %s | |
| define i8 @count_leading_zeros(i8) unnamed_addr { | |
| entry-block: | |
| %1 = tail call i8 @llvm.ctlz.i8(i8 %0) | |
| ret i8 %1 | |
| } | |
| declare i8 @llvm.ctlz.i8(i8) | |
| ; CHECK-LABEL: count_leading_zeros: | |
| ; CHECK: cpi [[RESULT:r[0-9]+]], 0 | |
| ; CHECK: brne LBB0_1 | |
| ; CHECK: rjmp LBB0_2 | |
| ; CHECK: mov [[SCRATCH:r[0-9]+]], {{.*}}[[RESULT]] | |
| ; CHECK: lsr {{.*}}[[SCRATCH]] | |
| ; CHECK: or {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] | |
| ; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] | |
| ; CHECK: lsr {{.*}}[[RESULT]] | |
| ; CHECK: lsr {{.*}}[[RESULT]] | |
| ; CHECK: or {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] | |
| ; CHECK: mov {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] | |
| ; CHECK: lsr {{.*}}[[SCRATCH]] | |
| ; CHECK: lsr {{.*}}[[SCRATCH]] | |
| ; CHECK: lsr {{.*}}[[SCRATCH]] | |
| ; CHECK: lsr {{.*}}[[SCRATCH]] | |
| ; CHECK: or {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] | |
| ; CHECK: com {{.*}}[[SCRATCH]] | |
| ; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] | |
| ; CHECK: lsr {{.*}}[[RESULT]] | |
| ; CHECK: andi {{.*}}[[RESULT]], 85 | |
| ; CHECK: sub {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] | |
| ; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] | |
| ; CHECK: andi {{.*}}[[RESULT]], 51 | |
| ; CHECK: lsr {{.*}}[[SCRATCH]] | |
| ; CHECK: lsr {{.*}}[[SCRATCH]] | |
| ; CHECK: andi {{.*}}[[SCRATCH]], 51 | |
| ; CHECK: add {{.*}}[[SCRATCH]], {{.*}}[[RESULT]] | |
| ; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] | |
| ; CHECK: lsr {{.*}}[[RESULT]] | |
| ; CHECK: lsr {{.*}}[[RESULT]] | |
| ; CHECK: lsr {{.*}}[[RESULT]] | |
| ; CHECK: lsr {{.*}}[[RESULT]] | |
| ; CHECK: add {{.*}}[[RESULT]], {{.*}}[[SCRATCH]] | |
| ; CHECK: andi {{.*}}[[RESULT]], 15 | |
| ; CHECK: ret | |
| ; CHECK: LBB0_2: | |
| ; CHECK: ldi {{.*}}[[RESULT]], 8 | |
| ; CHECK: ret |