derek.holloway
7502bf64a4
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37 lines
1.2 KiB
LLVM
37 lines
1.2 KiB
LLVM
; RUN: llc < %s -mtriple=avr | FileCheck %s
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define i8 @count_trailing_zeros(i8) unnamed_addr {
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entry-block:
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%1 = tail call i8 @llvm.cttz.i8(i8 %0)
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ret i8 %1
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}
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declare i8 @llvm.cttz.i8(i8)
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; CHECK-LABEL: count_trailing_zeros:
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; CHECK: cpi [[RESULT:r[0-9]+]], 0
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; CHECK: breq [[END_BB:.LBB[0-9]+_[0-9]+]]
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; CHECK: mov [[SCRATCH:r[0-9]+]], {{.*}}[[RESULT]]
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; CHECK: dec {{.*}}[[SCRATCH]]
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; CHECK: com {{.*}}[[RESULT]]
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; CHECK: and {{.*}}[[RESULT]], {{.*}}[[SCRATCH]]
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; CHECK: mov {{.*}}[[SCRATCH]], {{.*}}[[RESULT]]
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; CHECK: lsr {{.*}}[[SCRATCH]]
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; CHECK: andi {{.*}}[[SCRATCH]], 85
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; CHECK: sub {{.*}}[[RESULT]], {{.*}}[[SCRATCH]]
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; CHECK: mov {{.*}}[[SCRATCH]], {{.*}}[[RESULT]]
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; CHECK: andi {{.*}}[[SCRATCH]], 51
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; CHECK: lsr {{.*}}[[RESULT]]
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; CHECK: lsr {{.*}}[[RESULT]]
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; CHECK: andi {{.*}}[[RESULT]], 51
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; CHECK: add {{.*}}[[RESULT]], {{.*}}[[SCRATCH]]
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; CHECK: mov {{.*}}[[SCRATCH]], {{.*}}[[RESULT]]
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; CHECK: swap {{.*}}[[SCRATCH]]
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; CHECK: add {{.*}}[[SCRATCH]], {{.*}}[[RESULT]]
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; CHECK: mov {{.*}}[[RESULT]], {{.*}}[[SCRATCH]]
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; CHECK: andi {{.*}}[[RESULT]], 15
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; CHECK: ret
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; CHECK: [[END_BB]]:
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; CHECK: ldi {{.*}}[[RESULT]], 8
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; CHECK: ret
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