1 ; RUN: llc -regalloc=greedy < %s | FileCheck %s
3 ; LSR shouldn't introduce more induction variables than needed, increasing
4 ; register pressure and therefore spilling. There is more room for improvement
7 ; CHECK: sub sp, #{{32|28|24}}
10 ; CHECK: ldr{{(.w)?}} r{{.*}}, [sp, #
11 ; CHECK: ldr{{(.w)?}} r{{.*}}, [sp, #
12 ; CHECK: ldr{{(.w)?}} r{{.*}}, [sp, #
15 target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
16 target triple = "thumbv7-apple-macosx10.7.0"
18 %struct.partition_entry = type { i32, i32, i64, i64 }
20 define i32 @partition_overlap_check(%struct.partition_entry* nocapture %part, i32 %num_entries) nounwind readonly optsize ssp {
22 %cmp79 = icmp sgt i32 %num_entries, 0
23 br i1 %cmp79, label %outer.loop, label %for.end72
25 outer.loop: ; preds = %for.inc69, %entry
26 %overlap.081 = phi i32 [ %overlap.4, %for.inc69 ], [ 0, %entry ]
27 %0 = phi i32 [ %inc71, %for.inc69 ], [ 0, %entry ]
28 %offset = getelementptr %struct.partition_entry* %part, i32 %0, i32 2
29 %len = getelementptr %struct.partition_entry* %part, i32 %0, i32 3
30 %tmp5 = load i64* %offset, align 4, !tbaa !0
31 %tmp15 = load i64* %len, align 4, !tbaa !0
32 %add = add nsw i64 %tmp15, %tmp5
35 inner.loop: ; preds = %for.inc, %outer.loop
36 %overlap.178 = phi i32 [ %overlap.081, %outer.loop ], [ %overlap.4, %for.inc ]
37 %1 = phi i32 [ 0, %outer.loop ], [ %inc, %for.inc ]
38 %cmp23 = icmp eq i32 %0, %1
39 br i1 %cmp23, label %for.inc, label %if.end
41 if.end: ; preds = %inner.loop
42 %len39 = getelementptr %struct.partition_entry* %part, i32 %1, i32 3
43 %offset28 = getelementptr %struct.partition_entry* %part, i32 %1, i32 2
44 %tmp29 = load i64* %offset28, align 4, !tbaa !0
45 %tmp40 = load i64* %len39, align 4, !tbaa !0
46 %add41 = add nsw i64 %tmp40, %tmp29
47 %cmp44 = icmp sge i64 %tmp29, %tmp5
48 %cmp47 = icmp slt i64 %tmp29, %add
49 %or.cond = and i1 %cmp44, %cmp47
50 %overlap.2 = select i1 %or.cond, i32 1, i32 %overlap.178
51 %cmp52 = icmp sle i64 %add41, %add
52 %cmp56 = icmp sgt i64 %add41, %tmp5
53 %or.cond74 = and i1 %cmp52, %cmp56
54 %overlap.3 = select i1 %or.cond74, i32 1, i32 %overlap.2
55 %cmp61 = icmp sgt i64 %tmp29, %tmp5
56 %cmp65 = icmp slt i64 %add41, %add
57 %or.cond75 = or i1 %cmp61, %cmp65
58 br i1 %or.cond75, label %for.inc, label %if.then66
60 if.then66: ; preds = %if.end
63 for.inc: ; preds = %if.end, %if.then66, %inner.loop
64 %overlap.4 = phi i32 [ %overlap.178, %inner.loop ], [ 1, %if.then66 ], [ %overlap.3, %if.end ]
65 %inc = add nsw i32 %1, 1
66 %exitcond = icmp eq i32 %inc, %num_entries
67 br i1 %exitcond, label %for.inc69, label %inner.loop
69 for.inc69: ; preds = %for.inc
70 %inc71 = add nsw i32 %0, 1
71 %exitcond83 = icmp eq i32 %inc71, %num_entries
72 br i1 %exitcond83, label %for.end72, label %outer.loop
74 for.end72: ; preds = %for.inc69, %entry
75 %overlap.0.lcssa = phi i32 [ 0, %entry ], [ %overlap.4, %for.inc69 ]
76 ret i32 %overlap.0.lcssa
79 !0 = metadata !{metadata !"long long", metadata !1}
80 !1 = metadata !{metadata !"omnipotent char", metadata !2}
81 !2 = metadata !{metadata !"Simple C/C++ TBAA", null}