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38 lines
968 B
LLVM
38 lines
968 B
LLVM
; REQUIRES: asserts
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; RUN: opt < %s -loop-unswitch -stats -disable-output 2>&1 | grep "1 loop-unswitch - Number of branches unswitched" | count 1
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; PR 3170
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define i32 @a(i32 %x, i32 %y) nounwind {
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entry:
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%0 = icmp ult i32 0, %y ; <i1> [#uses=1]
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br i1 %0, label %bb.nph, label %bb4
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bb.nph: ; preds = %entry
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%1 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
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br label %bb
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bb: ; preds = %bb.nph, %bb3
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%i.01 = phi i32 [ %3, %bb3 ], [ 0, %bb.nph ] ; <i32> [#uses=1]
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br i1 %1, label %bb2, label %bb1
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bb1: ; preds = %bb
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%2 = tail call i32 (...)* @b() nounwind ; <i32> [#uses=0]
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br label %bb2
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bb2: ; preds = %bb, %bb1
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%3 = add i32 %i.01, 1 ; <i32> [#uses=2]
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br label %bb3
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bb3: ; preds = %bb2
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%i.0 = phi i32 [ %3, %bb2 ] ; <i32> [#uses=1]
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%4 = icmp ult i32 %i.0, %y ; <i1> [#uses=1]
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br i1 %4, label %bb, label %bb3.bb4_crit_edge
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bb3.bb4_crit_edge: ; preds = %bb3
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br label %bb4
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bb4: ; preds = %bb3.bb4_crit_edge, %entry
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ret i32 0
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}
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declare i32 @b(...)
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