| Serge Pavlov | 098ee2f | 2017-01-24 06:58:39 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -S -loop-unroll -unroll-force-peel-count=3 -verify-dom-info -simplifycfg -instcombine | FileCheck %s |
| Michael Kuperstein | b151a64 | 2016-11-30 21:13:57 +0000 | [diff] [blame] | 2 | |
| 3 | ; Basic loop peeling - check that we can peel-off the first 3 loop iterations |
| 4 | ; when explicitly requested. |
| 5 | ; CHECK-LABEL: @basic |
| 6 | ; CHECK: %[[CMP0:.*]] = icmp sgt i32 %k, 0 |
| 7 | ; CHECK: br i1 %[[CMP0]], label %[[NEXT0:.*]], label %for.end |
| 8 | ; CHECK: [[NEXT0]]: |
| 9 | ; CHECK: store i32 0, i32* %p, align 4 |
| 10 | ; CHECK: %[[CMP1:.*]] = icmp eq i32 %k, 1 |
| 11 | ; CHECK: br i1 %[[CMP1]], label %for.end, label %[[NEXT1:.*]] |
| 12 | ; CHECK: [[NEXT1]]: |
| 13 | ; CHECK: %[[INC1:.*]] = getelementptr inbounds i32, i32* %p, i64 1 |
| 14 | ; CHECK: store i32 1, i32* %[[INC1]], align 4 |
| 15 | ; CHECK: %[[CMP2:.*]] = icmp sgt i32 %k, 2 |
| 16 | ; CHECK: br i1 %[[CMP2]], label %[[NEXT2:.*]], label %for.end |
| 17 | ; CHECK: [[NEXT2]]: |
| 18 | ; CHECK: %[[INC2:.*]] = getelementptr inbounds i32, i32* %p, i64 2 |
| 19 | ; CHECK: store i32 2, i32* %[[INC2]], align 4 |
| 20 | ; CHECK: %[[CMP3:.*]] = icmp eq i32 %k, 3 |
| 21 | ; CHECK: br i1 %[[CMP3]], label %for.end, label %[[LOOP:.*]] |
| 22 | ; CHECK: [[LOOP]]: |
| 23 | ; CHECK: %[[IV:.*]] = phi i32 [ {{.*}}, %[[LOOP]] ], [ 3, %[[NEXT2]] ] |
| 24 | |
| 25 | define void @basic(i32* %p, i32 %k) #0 { |
| 26 | entry: |
| 27 | %cmp3 = icmp slt i32 0, %k |
| 28 | br i1 %cmp3, label %for.body.lr.ph, label %for.end |
| 29 | |
| 30 | for.body.lr.ph: ; preds = %entry |
| 31 | br label %for.body |
| 32 | |
| 33 | for.body: ; preds = %for.body.lr.ph, %for.body |
| 34 | %i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ] |
| 35 | %p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %for.body ] |
| 36 | %incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1 |
| 37 | store i32 %i.05, i32* %p.addr.04, align 4 |
| 38 | %inc = add nsw i32 %i.05, 1 |
| 39 | %cmp = icmp slt i32 %inc, %k |
| 40 | br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge |
| 41 | |
| 42 | for.cond.for.end_crit_edge: ; preds = %for.body |
| 43 | br label %for.end |
| 44 | |
| 45 | for.end: ; preds = %for.cond.for.end_crit_edge, %entry |
| 46 | ret void |
| 47 | } |
| 48 | |
| 49 | ; Make sure peeling works correctly when a value defined in a loop is used |
| 50 | ; in later code - we need to correctly plumb the phi depending on which |
| 51 | ; iteration is actually used. |
| 52 | ; CHECK-LABEL: @output |
| 53 | ; CHECK: %[[CMP0:.*]] = icmp sgt i32 %k, 0 |
| 54 | ; CHECK: br i1 %[[CMP0]], label %[[NEXT0:.*]], label %for.end |
| 55 | ; CHECK: [[NEXT0]]: |
| 56 | ; CHECK: store i32 0, i32* %p, align 4 |
| 57 | ; CHECK: %[[CMP1:.*]] = icmp eq i32 %k, 1 |
| 58 | ; CHECK: br i1 %[[CMP1]], label %for.end, label %[[NEXT1:.*]] |
| 59 | ; CHECK: [[NEXT1]]: |
| 60 | ; CHECK: %[[INC1:.*]] = getelementptr inbounds i32, i32* %p, i64 1 |
| 61 | ; CHECK: store i32 1, i32* %[[INC1]], align 4 |
| 62 | ; CHECK: %[[CMP2:.*]] = icmp sgt i32 %k, 2 |
| 63 | ; CHECK: br i1 %[[CMP2]], label %[[NEXT2:.*]], label %for.end |
| 64 | ; CHECK: [[NEXT2]]: |
| 65 | ; CHECK: %[[INC2:.*]] = getelementptr inbounds i32, i32* %p, i64 2 |
| 66 | ; CHECK: store i32 2, i32* %[[INC2]], align 4 |
| 67 | ; CHECK: %[[CMP3:.*]] = icmp eq i32 %k, 3 |
| 68 | ; CHECK: br i1 %[[CMP3]], label %for.end, label %[[LOOP:.*]] |
| 69 | ; CHECK: [[LOOP]]: |
| 70 | ; CHECK: %[[IV:.*]] = phi i32 [ %[[IV:.*]], %[[LOOP]] ], [ 3, %[[NEXT2]] ] |
| 71 | ; CHECK: %ret = phi i32 [ 0, %entry ], [ 1, %[[NEXT0]] ], [ 2, %[[NEXT1]] ], [ 3, %[[NEXT2]] ], [ %[[IV]], %[[LOOP]] ] |
| 72 | ; CHECK: ret i32 %ret |
| 73 | define i32 @output(i32* %p, i32 %k) #0 { |
| 74 | entry: |
| 75 | %cmp3 = icmp slt i32 0, %k |
| 76 | br i1 %cmp3, label %for.body.lr.ph, label %for.end |
| 77 | |
| 78 | for.body.lr.ph: ; preds = %entry |
| 79 | br label %for.body |
| 80 | |
| 81 | for.body: ; preds = %for.body.lr.ph, %for.body |
| 82 | %i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ] |
| 83 | %p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %for.body ] |
| 84 | %incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1 |
| 85 | store i32 %i.05, i32* %p.addr.04, align 4 |
| 86 | %inc = add nsw i32 %i.05, 1 |
| 87 | %cmp = icmp slt i32 %inc, %k |
| 88 | br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge |
| 89 | |
| 90 | for.cond.for.end_crit_edge: ; preds = %for.body |
| 91 | br label %for.end |
| 92 | |
| 93 | for.end: ; preds = %for.cond.for.end_crit_edge, %entry |
| 94 | %ret = phi i32 [ 0, %entry], [ %inc, %for.cond.for.end_crit_edge ] |
| 95 | ret i32 %ret |
| 96 | } |