44 lines
1.2 KiB
LLVM
44 lines
1.2 KiB
LLVM
; RUN: opt -S -simplifycfg -mtriple=aarch64 < %s | FileCheck %s
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define i32 @ctlz(i32 %A) {
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; CHECK-LABEL: @ctlz(
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; CHECK: [[ICMP:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
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; CHECK-NEXT: [[CTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
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; CHECK-NEXT: [[SEL:%[A-Za-z0-9.]+]] = select i1 [[ICMP]], i32 32, i32 [[CTZ]]
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; CHECK-NEXT: ret i32 [[SEL]]
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entry:
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%tobool = icmp eq i32 %A, 0
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br i1 %tobool, label %cond.end, label %cond.true
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cond.true:
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%0 = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
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br label %cond.end
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cond.end:
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%cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
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ret i32 %cond
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}
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define i32 @cttz(i32 %A) {
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; CHECK-LABEL: @cttz(
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; CHECK: [[ICMP:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
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; CHECK-NEXT: [[CTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
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; CHECK-NEXT: [[SEL:%[A-Za-z0-9.]+]] = select i1 [[ICMP]], i32 32, i32 [[CTZ]]
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; CHECK-NEXT: ret i32 [[SEL]]
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entry:
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%tobool = icmp eq i32 %A, 0
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br i1 %tobool, label %cond.end, label %cond.true
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cond.true:
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%0 = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
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br label %cond.end
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cond.end:
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%cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
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ret i32 %cond
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}
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declare i32 @llvm.ctlz.i32(i32, i1)
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declare i32 @llvm.cttz.i32(i32, i1)
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