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; RUN: opt < %s -S -loop-unroll -unroll-runtime=true | FileCheck %s
; Tests for unrolling loops with run-time trip counts
; CHECK: %xtraiter = and i32 %n
; CHECK: %lcmp.mod = icmp ne i32 %xtraiter, 0
; CHECK: br i1 %lcmp.mod, label %for.body.prol, label %for.body.preheader.split
; CHECK: for.body.prol:
; CHECK: %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %for.body.prol ], [ 0, %for.body.preheader ]
; CHECK: %prol.iter.sub = sub i32 %prol.iter, 1
; CHECK: %prol.iter.cmp = icmp ne i32 %prol.iter.sub, 0
; CHECK: br i1 %prol.iter.cmp, label %for.body.prol, label %for.body.preheader.split, !llvm.loop !0
define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
entry:
%cmp1 = icmp eq i32 %n, 0
br i1 %cmp1, label %for.end, label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%sum.02 = phi i32 [ %add, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
%0 = load i32* %arrayidx, align 4
%add = add nsw i32 %0, %sum.02
%indvars.iv.next = add i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %n
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
ret i32 %sum.0.lcssa
}
; Still try to completely unroll loops with compile-time trip counts
; even if the -unroll-runtime is specified
; CHECK: for.body:
; CHECK-NOT: for.body.prol:
define i32 @test1(i32* nocapture %a) nounwind uwtable readonly {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%sum.01 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
%0 = load i32* %arrayidx, align 4
%add = add nsw i32 %0, %sum.01
%indvars.iv.next = add i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, 5
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret i32 %add
}
; This is test 2007-05-09-UnknownTripCount.ll which can be unrolled now
; if the -unroll-runtime option is turned on
; CHECK: bb72.2:
define void @foo(i32 %trips) {
entry:
br label %cond_true.outer
cond_true.outer:
%indvar1.ph = phi i32 [ 0, %entry ], [ %indvar.next2, %bb72 ]
br label %bb72
bb72:
%indvar.next2 = add i32 %indvar1.ph, 1
%exitcond3 = icmp eq i32 %indvar.next2, %trips
br i1 %exitcond3, label %cond_true138, label %cond_true.outer
cond_true138:
ret void
}
; Test run-time unrolling for a loop that counts down by -2.
; CHECK: for.body.prol:
; CHECK: br i1 %prol.iter.cmp, label %for.body.prol, label %for.body.preheader.split
define zeroext i16 @down(i16* nocapture %p, i32 %len) nounwind uwtable readonly {
entry:
%cmp2 = icmp eq i32 %len, 0
br i1 %cmp2, label %for.end, label %for.body
for.body: ; preds = %for.body, %entry
%p.addr.05 = phi i16* [ %incdec.ptr, %for.body ], [ %p, %entry ]
%len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %entry ]
%res.03 = phi i32 [ %add, %for.body ], [ 0, %entry ]
%incdec.ptr = getelementptr inbounds i16* %p.addr.05, i64 1
%0 = load i16* %p.addr.05, align 2
%conv = zext i16 %0 to i32
%add = add i32 %conv, %res.03
%sub = add nsw i32 %len.addr.04, -2
%cmp = icmp eq i32 %sub, 0
br i1 %cmp, label %for.cond.for.end_crit_edge, label %for.body
for.cond.for.end_crit_edge: ; preds = %for.body
%phitmp = trunc i32 %add to i16
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
%res.0.lcssa = phi i16 [ %phitmp, %for.cond.for.end_crit_edge ], [ 0, %entry ]
ret i16 %res.0.lcssa
}
; CHECK: !0 = distinct !{!0, !1}
; CHECK: !1 = !{!"llvm.loop.unroll.disable"}
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