1 ; RUN: llc %s -mcpu=core2 -o - | FileCheck %s
2 ; This test was failing while tracking the liveness in the register scavenger
3 ; during the branching folding pass. The allocation of the subregisters was
5 ; I.e., the faulty pattern looked like:
7 ; ECX = movl 3 <- CH was killed here.
10 ; This reduced test case triggers the crash before the fix, but does not
11 ; strictly speaking check that the resulting code is correct.
12 ; To check that the code is actually correct we would need to check the
13 ; liveness of the produced code.
15 ; Currently, we check that after ECX = movl 3, we do not have subb CH,
16 ; whereas CH could have been redefine in between and that would have been
18 ; <rdar://problem/16582185>
19 target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
20 target triple = "i386-apple-macosx10.9"
22 %struct.A = type { %struct.B, %struct.C, %struct.D*, [1 x i8*] }
23 %struct.B = type { i32, [4 x i8] }
24 %struct.C = type { i128 }
25 %struct.D = type { {}*, [0 x i32] }
26 %union.E = type { i32 }
28 ; CHECK-LABEL: __XXX1:
29 ; CHECK: movl $3, %ecx
30 ; CHECK-NOT: subb %{{[a-z]+}}, %ch
31 ; Function Attrs: nounwind optsize ssp
32 define fastcc void @__XXX1(%struct.A* %ht) #0 {
34 %const72 = bitcast i128 72 to i128
35 %const3 = bitcast i128 3 to i128
36 switch i32 undef, label %if.end196 [
38 i32 3, label %sw.bb2.i
41 sw.bb.i: ; preds = %entry
42 %call.i.i.i = tail call i32 undef(%struct.A* %ht, i8 zeroext 22, i32 undef, i32 0, %struct.D* undef)
43 %bf.load.i.i = load i128, i128* undef, align 4
44 %bf.lshr.i.i = lshr i128 %bf.load.i.i, %const72
45 %shl1.i.i = shl nuw nsw i128 %bf.lshr.i.i, 8
46 %shl.i.i = trunc i128 %shl1.i.i to i32
47 br i1 undef, label %cond.false10.i.i, label %__XXX2.exit.i.i
49 __XXX2.exit.i.i: ; preds = %sw.bb.i
50 %extract11.i.i.i = lshr i128 %bf.load.i.i, %const3
51 %extract.t12.i.i.i = trunc i128 %extract11.i.i.i to i32
52 %bf.cast7.i.i.i = and i32 %extract.t12.i.i.i, 3
53 %arrayidx.i.i.i = getelementptr inbounds %struct.A, %struct.A* %ht, i32 0, i32 3, i32 %bf.cast7.i.i.i
54 br label %cond.end12.i.i
56 cond.false10.i.i: ; preds = %sw.bb.i
57 %arrayidx.i6.i.i = getelementptr inbounds %struct.A, %struct.A* %ht, i32 0, i32 3, i32 0
58 br label %cond.end12.i.i
60 cond.end12.i.i: ; preds = %cond.false10.i.i, %__XXX2.exit.i.i
61 %.sink.in.i.i = phi i8** [ %arrayidx.i.i.i, %__XXX2.exit.i.i ], [ %arrayidx.i6.i.i, %cond.false10.i.i ]
62 %.sink.i.i = load i8*, i8** %.sink.in.i.i, align 4
63 %tmp = bitcast i8* %.sink.i.i to %union.E*
64 br i1 undef, label %for.body.i.i, label %if.end196
66 for.body.i.i: ; preds = %for.body.i.i, %cond.end12.i.i
67 %weak.i.i = getelementptr inbounds %union.E, %union.E* %tmp, i32 undef, i32 0
68 %tmp1 = load i32, i32* %weak.i.i, align 4
69 %cmp36.i.i = icmp ne i32 %tmp1, %shl.i.i
70 %or.cond = and i1 %cmp36.i.i, false
71 br i1 %or.cond, label %for.body.i.i, label %if.end196
73 sw.bb2.i: ; preds = %entry
74 %bf.lshr.i85.i = lshr i128 undef, %const72
75 br i1 undef, label %if.end196, label %__XXX2.exit.i95.i
77 __XXX2.exit.i95.i: ; preds = %sw.bb2.i
78 %extract11.i.i91.i = lshr i128 undef, %const3
81 if.end196: ; preds = %__XXX2.exit.i95.i, %sw.bb2.i, %for.body.i.i, %cond.end12.i.i, %entry
85 attributes #0 = { nounwind optsize ssp "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" }