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1; RUN: llc < %s -verify-machineinstrs -disable-fp-elim -disable-machine-dce -verify-coalescing
2target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
3target triple = "x86_64-apple-macosx10.7.0"
4
5; This test case has a sub-register join followed by a remat:
6;
7; 256L    %vreg2<def> = COPY %vreg7:sub_32bit<kill>; GR32:%vreg2 GR64:%vreg7
8;         Considering merging %vreg2 with %vreg7:sub_32bit
9;         Cross-class to GR64.
10;                 RHS = %vreg2 = [256d,272d:0)  0@256d
11;                 LHS = %vreg7 = [208d,256d:0)[304L,480L:0)  0@208d
12;                 updated: 272L   %vreg0<def> = COPY %vreg7:sub_32bit<kill>; GR32:%vreg0 GR64:%vreg7
13;         Joined. Result = %vreg7 = [208d,272d:0)[304L,480L:0)  0@208d
14;
15; 272L    %vreg10:sub_32bit<def> = COPY %vreg7:sub_32bit<kill>, %vreg10<imp-def>; GR64:%vreg10,%vreg7
16;         Considering merging %vreg7 with %vreg10
17;                 RHS = %vreg7 = [208d,272d:0)[304L,480L:0)  0@208d
18;                 LHS = %vreg10 = [16d,64L:2)[64L,160L:1)[192L,240L:1)[272d,304L:3)[304L,352d:1)[352d,400d:0)[400d,400S:4)  0@352d 1@64L-phidef 2@16d-phikill 3@272d-phikill 4@400d
19; Remat: %vreg10<def> = MOV64r0 %vreg10<imp-def>, %EFLAGS<imp-def,dead>, %vreg10<imp-def>; GR64:%vreg10
20; Shrink: %vreg7 = [208d,272d:0)[304L,480L:0)  0@208d
21;  live-in at 240L
22;  live-in at 416L
23;  live-in at 320L
24;  live-in at 304L
25; Shrunk: %vreg7 = [208d,256d:0)[304L,480L:0)  0@208d
26;
27; The COPY at 256L is rewritten as a partial def, and that would artificially
28; extend the live range of %vreg7 to end at 256d.  When the joined copy is
29; removed, -verify-coalescing complains about the dangling kill.
30;
31; <rdar://problem/9967101>
32
33define void @f1() nounwind uwtable ssp {
34bb:
35  br label %bb1
36
37bb1:
38  %tmp = phi i32 [ 0, %bb ], [ %tmp21, %bb20 ]
39  br label %bb2
40
41bb2:
42  br i1 undef, label %bb5, label %bb8
43
44bb4:
45  br i1 undef, label %bb2, label %bb20
46
47bb5:
48  br i1 undef, label %bb4, label %bb20
49
50bb8:
51  %tmp9 = phi i32 [ %tmp24, %bb23 ], [ 0, %bb2 ]
52  br i1 false, label %bb41, label %bb10
53
54bb10:
55  %tmp11 = sub nsw i32 %tmp9, %tmp
56  br i1 false, label %bb2, label %bb26
57
58bb20:
59  %tmp21 = phi i32 [ undef, %bb4 ], [ undef, %bb5 ], [ %tmp9, %bb27 ], [ undef, %bb32 ]
60  %tmp22 = phi i32 [ undef, %bb4 ], [ undef, %bb5 ], [ %tmp11, %bb27 ], [ undef, %bb32 ]
61  br label %bb1
62
63bb23:
64  %tmp24 = add nsw i32 %tmp9, 1
65  br label %bb8
66
67bb26:
68  br i1 undef, label %bb27, label %bb32
69
70bb27:
71  %tmp28 = zext i32 %tmp11 to i64
72  %tmp30 = icmp eq i64 undef, %tmp28
73  br i1 %tmp30, label %bb20, label %bb27
74
75bb32:
76  br i1 undef, label %bb20, label %bb23
77
78bb41:
79  ret void
80}
81