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