; RUN: opt -S -structurizecfg %s -o - | FileCheck %s
; The structurize cfg pass used to do a post-order traversal to generate a list
; of ; basic blocks and then operate on the list in reverse. This led to bugs,
; because sometimes successors would be visited before their predecessors.
; The fix for this was to do a reverse post-order traversal which is what the
; algorithm requires.
; Function Attrs: nounwind
define void @test(ptr nocapture %out, i32 %K1, ptr nocapture readonly %nr) {
; CHECK: entry:
; CHECK: br label %for.body
entry:
br label %for.body
; CHECK: for.body:
; CHECK: br i1 %cmp1.inv, label %lor.lhs.false, label %Flow
for.body: ; preds = %for.body.backedge, %entry
%indvars.iv = phi i64 [ %indvars.iv.be, %for.body.backedge ], [ 1, %entry ]
%best_val.027 = phi float [ %best_val.027.be, %for.body.backedge ], [ 5.000000e+01, %entry ]
%prev_start.026 = phi i32 [ %tmp26, %for.body.backedge ], [ 0, %entry ]
%best_count.025 = phi i32 [ %best_count.025.be, %for.body.backedge ], [ 0, %entry ]
%tmp0 = trunc i64 %indvars.iv to i32
%cmp1 = icmp eq i32 %tmp0, %K1
br i1 %cmp1, label %if.then, label %lor.lhs.false
; CHECK: lor.lhs.false:
; CHECK: br label %Flow
lor.lhs.false: ; preds = %for.body
%arrayidx = getelementptr inbounds float, ptr %nr, i64 %indvars.iv
%tmp1 = load float, ptr %arrayidx, align 4
%tmp2 = add nsw i64 %indvars.iv, -1
%arrayidx2 = getelementptr inbounds float, ptr %nr, i64 %tmp2
%tmp3 = load float, ptr %arrayidx2, align 4
%cmp3 = fcmp une float %tmp1, %tmp3
br i1 %cmp3, label %if.then, label %for.body.1
; CHECK: Flow:
; CHECK: br i1 %{{[0-9]+}}, label %if.then, label %Flow1
; CHECK: if.then:
; CHECK: br label %Flow1
if.then: ; preds = %lor.lhs.false, %for.body
%sub4 = sub nsw i32 %tmp0, %prev_start.026
%tmp4 = add nsw i64 %indvars.iv, -1
%arrayidx8 = getelementptr inbounds float, ptr %nr, i64 %tmp4
%tmp5 = load float, ptr %arrayidx8, align 4
br i1 %cmp1, label %for.end, label %for.body.1
; CHECK: for.end:
; CHECK: ret void
for.end: ; preds = %for.body.1, %if.then
%best_val.0.lcssa = phi float [ %best_val.233, %for.body.1 ], [ %tmp5, %if.then ]
store float %best_val.0.lcssa, ptr %out, align 4
ret void
; CHECK: Flow1
; CHECK: br i1 %{{[0-9]}}, label %for.body.1, label %Flow2
; CHECK: for.body.1:
; CHECK: %cmp1.5 = icmp ne i32 %tmp22, %K1
; CHECK: br i1 %cmp1.5, label %for.body.6, label %Flow3
for.body.1: ; preds = %if.then, %lor.lhs.false
%best_val.233 = phi float [ %tmp5, %if.then ], [ %best_val.027, %lor.lhs.false ]
%best_count.231 = phi i32 [ %sub4, %if.then ], [ %best_count.025, %lor.lhs.false ]
%indvars.iv.next.454 = add nsw i64 %indvars.iv, 5
%tmp22 = trunc i64 %indvars.iv.next.454 to i32
%cmp1.5 = icmp eq i32 %tmp22, %K1
br i1 %cmp1.5, label %for.end, label %for.body.6
; CHECK: Flow2:
; CHECK: br i1 %{{[0-9]+}}, label %for.end, label %for.body
; CHECK: for.body.6:
; CHECK: br i1 %cmp5.6, label %if.then6.6, label %for.body.backedge
for.body.6: ; preds = %for.body.1
%indvars.iv.next.559 = add nsw i64 %indvars.iv, 6
%tmp26 = trunc i64 %indvars.iv.next.559 to i32
%sub4.6 = sub nsw i32 %tmp26, %tmp22
%cmp5.6 = icmp slt i32 %best_count.231, %sub4.6
br i1 %cmp5.6, label %if.then6.6, label %for.body.backedge
; CHECK: if.then6.6
; CHECK: br label %for.body.backedge
if.then6.6: ; preds = %for.body.6
%arrayidx8.6 = getelementptr inbounds float, ptr %nr, i64 %indvars.iv.next.454
%tmp29 = load float, ptr %arrayidx8.6, align 4
br label %for.body.backedge
; CHECK: Flow3:
; CHECK: br label %Flow2
; CHECK: for.body.backedge:
; CHECK: br label %Flow3
for.body.backedge: ; preds = %if.then6.6, %for.body.6
%best_val.027.be = phi float [ %tmp29, %if.then6.6 ], [ %best_val.233, %for.body.6 ]
%best_count.025.be = phi i32 [ %sub4.6, %if.then6.6 ], [ %best_count.231, %for.body.6 ]
%indvars.iv.be = add nsw i64 %indvars.iv, 7
br label %for.body
}
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