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25 lines
796 B
25 lines
796 B
4 months ago
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; Here we have a case where there are two loops and LICM is hoisting an
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; instruction from one loop into the other loop! This is obviously bad and
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; happens because preheader insertion doesn't insert a preheader for this
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; case... bad.
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; RUN: opt < %s -licm -loop-deletion -simplifycfg -S | \
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; RUN: not grep "br "
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define i32 @main(i32 %argc) {
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; <label>:0
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br label %bb5
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bb5: ; preds = %bb5, %0
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%I = phi i32 [ 0, %0 ], [ %I2, %bb5 ] ; <i32> [#uses=1]
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%I2 = add i32 %I, 1 ; <i32> [#uses=2]
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%c = icmp eq i32 %I2, 10 ; <i1> [#uses=1]
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br i1 %c, label %bb5, label %bb8
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bb8: ; preds = %bb8, %bb5
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%cann-indvar = phi i32 [ 0, %bb8 ], [ 0, %bb5 ] ; <i32> [#uses=0]
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%X = add i32 %argc, %argc ; <i32> [#uses=1]
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br i1 false, label %bb8, label %bb10
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bb10: ; preds = %bb8
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ret i32 %X
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}
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