| Sanjoy Das | c5676df | 2014-11-13 00:00:58 +0000 | [diff] [blame] | 1 | ;; RUN: opt -S < %s -indvars | FileCheck %s |
| 2 | |
| 3 | ;; Check if llvm can narrow !range metadata based on loop entry |
| 4 | ;; predicates. |
| 5 | |
| 6 | declare void @abort() |
| 7 | |
| 8 | define i1 @bounded_below_slt(i32* nocapture readonly %buffer) { |
| 9 | ; CHECK-LABEL: bounded_below_slt |
| 10 | entry: |
| 11 | %length = load i32* %buffer, !range !0 |
| 12 | %entry.pred = icmp eq i32 %length, 0 |
| 13 | br i1 %entry.pred, label %abort, label %loop.preheader |
| 14 | |
| 15 | loop.preheader: |
| 16 | br label %loop |
| 17 | |
| 18 | loop: |
| 19 | ; CHECK: loop |
| 20 | %idx = phi i32 [ %idx.inc, %loop.next ], [ 0, %loop.preheader ] |
| 21 | %oob.pred = icmp slt i32 %idx, %length |
| 22 | br i1 %oob.pred, label %loop.next, label %oob |
| 23 | ; CHECK: br i1 true, label %loop.next, label %oob |
| 24 | |
| 25 | loop.next: |
| 26 | ; CHECK: loop.next |
| 27 | %idx.inc = add i32 %idx, 1 |
| 28 | %exit.pred = icmp slt i32 %idx.inc, %length |
| 29 | br i1 %exit.pred, label %loop, label %abort.loopexit |
| 30 | |
| 31 | abort.loopexit: |
| 32 | br label %abort |
| 33 | |
| 34 | abort: |
| 35 | ret i1 false |
| 36 | |
| 37 | oob: |
| 38 | tail call void @abort() |
| 39 | ret i1 false |
| 40 | } |
| 41 | |
| 42 | define i1 @bounded_below_sle(i32* nocapture readonly %buffer) { |
| 43 | ; CHECK-LABEL: bounded_below_sle |
| 44 | entry: |
| 45 | %length = load i32* %buffer, !range !0 |
| 46 | %entry.pred = icmp eq i32 %length, 0 |
| 47 | br i1 %entry.pred, label %abort, label %loop.preheader |
| 48 | |
| 49 | loop.preheader: |
| 50 | br label %loop |
| 51 | |
| 52 | loop: |
| 53 | ; CHECK: loop |
| 54 | %idx = phi i32 [ %idx.inc, %loop.next ], [ 0, %loop.preheader ] |
| 55 | %oob.pred = icmp sle i32 %idx, %length |
| 56 | br i1 %oob.pred, label %loop.next, label %oob |
| 57 | ; CHECK: br i1 true, label %loop.next, label %oob |
| 58 | |
| 59 | loop.next: |
| 60 | ; CHECK: loop.next |
| 61 | %idx.inc = add i32 %idx, 1 |
| 62 | %exit.pred = icmp sle i32 %idx.inc, %length |
| 63 | br i1 %exit.pred, label %loop, label %abort.loopexit |
| 64 | |
| 65 | abort.loopexit: |
| 66 | br label %abort |
| 67 | |
| 68 | abort: |
| 69 | ret i1 false |
| 70 | |
| 71 | oob: |
| 72 | tail call void @abort() |
| 73 | ret i1 false |
| 74 | } |
| 75 | |
| 76 | ;; Assert that we're not making an incorrect transform. |
| 77 | |
| 78 | declare i32 @check(i8*) |
| 79 | |
| 80 | define void @NoChange() { |
| 81 | ; CHECK-LABEL: NoChange |
| 82 | entry: |
| 83 | br label %loop.begin |
| 84 | |
| 85 | loop.begin: |
| 86 | ; CHECK: loop.begin: |
| 87 | %i.01 = phi i64 [ 2, %entry ], [ %add, %loop.end ] |
| 88 | %cmp = icmp ugt i64 %i.01, 1 |
| 89 | ; CHECK: %cmp = icmp ugt i64 %i.01, 1 |
| 90 | br i1 %cmp, label %loop, label %loop.end |
| 91 | |
| 92 | loop: |
| 93 | ; CHECK: loop |
| 94 | %.sum = add i64 %i.01, -2 |
| David Blaikie | 79e6c74 | 2015-02-27 19:29:02 +0000 | [diff] [blame] | 95 | %v = getelementptr inbounds i8, i8* null, i64 %.sum |
| Sanjoy Das | c5676df | 2014-11-13 00:00:58 +0000 | [diff] [blame] | 96 | %r = tail call i32 @check(i8* %v) |
| 97 | %c = icmp eq i32 %r, 0 |
| 98 | br i1 %c, label %loop.end, label %abort.now |
| 99 | |
| 100 | abort.now: |
| 101 | tail call void @abort() |
| 102 | unreachable |
| 103 | |
| 104 | loop.end: |
| 105 | %add = add i64 %i.01, -1 |
| 106 | %eq = icmp eq i64 %add, 0 |
| 107 | br i1 %eq, label %exit, label %loop.begin |
| 108 | |
| 109 | exit: |
| 110 | ret void |
| 111 | } |
| 112 | |
| Duncan P. N. Exon Smith | be7ea19 | 2014-12-15 19:07:53 +0000 | [diff] [blame] | 113 | !0 = !{i32 0, i32 100} |