1 ; RUN: opt -passes=loop-idiom -S < %s | FileCheck %s
3 target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
4 target triple = "arm64-apple-ios8.0.0"
6 ; When we replace the precondition with a ctpop, we need to ensure
7 ; that only the first branch reads the ctpop. The store prior
8 ; to that should continue to read from the original compare.
10 ; CHECK: %tobool.5 = icmp ne i32 %num, 0
11 ; CHECK: store i1 %tobool.5, ptr %ptr
13 define internal fastcc i32 @num_bits_set(i32 %num, ptr %ptr) #1 {
15 %tobool.5 = icmp ne i32 %num, 0
16 store i1 %tobool.5, ptr %ptr
17 br i1 %tobool.5, label %for.body.lr.ph, label %for.end
19 for.body.lr.ph: ; preds = %entry
22 for.body: ; preds = %for.body.lr.ph, %for.body
23 %count.07 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
24 %num.addr.06 = phi i32 [ %num, %for.body.lr.ph ], [ %and, %for.body ]
25 %sub = add i32 %num.addr.06, -1
26 %and = and i32 %sub, %num.addr.06
27 %inc = add nsw i32 %count.07, 1
28 %tobool = icmp ne i32 %and, 0
29 br i1 %tobool, label %for.body, label %for.end
31 for.end: ; preds = %for.cond.for.end_crit_edge, %entry
32 %count.0.lcssa = phi i32 [ %inc, %for.body ], [ 0, %entry ]
33 ret i32 %count.0.lcssa