1 ; RUN: opt < %s -S -loop-unroll -unroll-runtime=true | FileCheck %s 2 3 ; Tests for unrolling loops with run-time trip counts 4 5 ; CHECK: unr.cmp{{.*}}: 6 ; CHECK: for.body.unr{{.*}}: 7 ; CHECK: for.body: 8 ; CHECK: br i1 %exitcond.7, label %for.end.loopexit{{.*}}, label %for.body 9 10 define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly { 11 entry: 12 %cmp1 = icmp eq i32 %n, 0 13 br i1 %cmp1, label %for.end, label %for.body 14 15 for.body: ; preds = %for.body, %entry 16 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 17 %sum.02 = phi i32 [ %add, %for.body ], [ 0, %entry ] 18 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv 19 %0 = load i32* %arrayidx, align 4 20 %add = add nsw i32 %0, %sum.02 21 %indvars.iv.next = add i64 %indvars.iv, 1 22 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 23 %exitcond = icmp eq i32 %lftr.wideiv, %n 24 br i1 %exitcond, label %for.end, label %for.body 25 26 for.end: ; preds = %for.body, %entry 27 %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ] 28 ret i32 %sum.0.lcssa 29 } 30 31 32 ; Still try to completely unroll loops with compile-time trip counts 33 ; even if the -unroll-runtime is specified 34 35 ; CHECK: for.body: 36 ; CHECK-NOT: for.body.unr: 37 38 define i32 @test1(i32* nocapture %a) nounwind uwtable readonly { 39 entry: 40 br label %for.body 41 42 for.body: ; preds = %for.body, %entry 43 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 44 %sum.01 = phi i32 [ 0, %entry ], [ %add, %for.body ] 45 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv 46 %0 = load i32* %arrayidx, align 4 47 %add = add nsw i32 %0, %sum.01 48 %indvars.iv.next = add i64 %indvars.iv, 1 49 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 50 %exitcond = icmp eq i32 %lftr.wideiv, 5 51 br i1 %exitcond, label %for.end, label %for.body 52 53 for.end: ; preds = %for.body 54 ret i32 %add 55 } 56 57 ; This is test 2007-05-09-UnknownTripCount.ll which can be unrolled now 58 ; if the -unroll-runtime option is turned on 59 60 ; CHECK: bb72.2: 61 62 define void @foo(i32 %trips) { 63 entry: 64 br label %cond_true.outer 65 66 cond_true.outer: 67 %indvar1.ph = phi i32 [ 0, %entry ], [ %indvar.next2, %bb72 ] 68 br label %bb72 69 70 bb72: 71 %indvar.next2 = add i32 %indvar1.ph, 1 72 %exitcond3 = icmp eq i32 %indvar.next2, %trips 73 br i1 %exitcond3, label %cond_true138, label %cond_true.outer 74 75 cond_true138: 76 ret void 77 } 78 79 80 ; Test run-time unrolling for a loop that counts down by -2. 81 82 ; CHECK: for.body.unr: 83 ; CHECK: br i1 %cmp.7, label %for.cond.for.end_crit_edge{{.*}}, label %for.body 84 85 define zeroext i16 @down(i16* nocapture %p, i32 %len) nounwind uwtable readonly { 86 entry: 87 %cmp2 = icmp eq i32 %len, 0 88 br i1 %cmp2, label %for.end, label %for.body 89 90 for.body: ; preds = %for.body, %entry 91 %p.addr.05 = phi i16* [ %incdec.ptr, %for.body ], [ %p, %entry ] 92 %len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %entry ] 93 %res.03 = phi i32 [ %add, %for.body ], [ 0, %entry ] 94 %incdec.ptr = getelementptr inbounds i16* %p.addr.05, i64 1 95 %0 = load i16* %p.addr.05, align 2 96 %conv = zext i16 %0 to i32 97 %add = add i32 %conv, %res.03 98 %sub = add nsw i32 %len.addr.04, -2 99 %cmp = icmp eq i32 %sub, 0 100 br i1 %cmp, label %for.cond.for.end_crit_edge, label %for.body 101 102 for.cond.for.end_crit_edge: ; preds = %for.body 103 %phitmp = trunc i32 %add to i16 104 br label %for.end 105 106 for.end: ; preds = %for.cond.for.end_crit_edge, %entry 107 %res.0.lcssa = phi i16 [ %phitmp, %for.cond.for.end_crit_edge ], [ 0, %entry ] 108 ret i16 %res.0.lcssa 109 } 110
