34 lines
1.3 KiB
LLVM
34 lines
1.3 KiB
LLVM
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; RUN: opt -loop-idiom -S < %s | FileCheck %s
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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target triple = "arm64-apple-ios8.0.0"
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; When we replace the precondition with a ctpop, we need to ensure
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; that only the first branch reads the ctpop. The store prior
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; to that should continue to read from the original compare.
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; CHECK: %tobool.5 = icmp ne i32 %num, 0
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; CHECK: store i1 %tobool.5, i1* %ptr
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define internal fastcc i32 @num_bits_set(i32 %num, i1* %ptr) #1 {
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entry:
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%tobool.5 = icmp ne i32 %num, 0
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store i1 %tobool.5, i1* %ptr
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br i1 %tobool.5, label %for.body.lr.ph, label %for.end
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for.body.lr.ph: ; preds = %entry
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br label %for.body
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for.body: ; preds = %for.body.lr.ph, %for.body
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%count.07 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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%num.addr.06 = phi i32 [ %num, %for.body.lr.ph ], [ %and, %for.body ]
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%sub = add i32 %num.addr.06, -1
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%and = and i32 %sub, %num.addr.06
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%inc = add nsw i32 %count.07, 1
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%tobool = icmp ne i32 %and, 0
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br i1 %tobool, label %for.body, label %for.end
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for.end: ; preds = %for.cond.for.end_crit_edge, %entry
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%count.0.lcssa = phi i32 [ %inc, %for.body ], [ 0, %entry ]
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ret i32 %count.0.lcssa
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}
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