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This is the last remaining bug that I know of in the loop extractor. The loop
extractor has extracted hundreds of loops from the SPEC benchmarks without crashing and without misoptimizing the programs. This testcase could be reduced substantially more by hand, but I don't have time to work on it right now. llvm-svn: 12495
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Chris Lattner
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; RUN: llvm-as < %s | opt -loop-extract -disable-output
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implementation ; Functions:
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declare int %_IO_getc()
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declare void %__errno_location()
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void %yylex() {
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entry:
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switch uint 0, label %label.126 [
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uint 0, label %return
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uint 61, label %combine
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uint 33, label %combine
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uint 94, label %combine
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uint 37, label %combine
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uint 47, label %combine
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uint 42, label %combine
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uint 62, label %combine
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uint 60, label %combine
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uint 58, label %combine
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uint 124, label %combine
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uint 38, label %combine
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uint 45, label %combine
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uint 43, label %combine
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uint 34, label %string_constant
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uint 39, label %char_constant
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uint 46, label %loopexit.2
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uint 57, label %loopexit.2
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uint 56, label %loopexit.2
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uint 55, label %loopexit.2
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uint 54, label %loopexit.2
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uint 53, label %loopexit.2
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uint 52, label %loopexit.2
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uint 51, label %loopexit.2
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uint 50, label %loopexit.2
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uint 49, label %loopexit.2
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uint 48, label %loopexit.2
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uint 95, label %letter
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uint 122, label %letter
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uint 121, label %letter
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uint 120, label %letter
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uint 119, label %letter
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uint 118, label %letter
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uint 117, label %letter
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uint 116, label %letter
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uint 115, label %letter
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uint 114, label %letter
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uint 113, label %letter
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uint 112, label %letter
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uint 111, label %letter
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uint 110, label %letter
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uint 109, label %letter
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uint 108, label %letter
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uint 107, label %letter
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uint 106, label %letter
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uint 105, label %letter
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uint 104, label %letter
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uint 103, label %letter
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uint 102, label %letter
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uint 101, label %letter
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uint 100, label %letter
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uint 99, label %letter
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uint 98, label %letter
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uint 97, label %letter
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uint 90, label %letter
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uint 89, label %letter
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uint 88, label %letter
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uint 87, label %letter
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uint 86, label %letter
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uint 85, label %letter
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uint 84, label %letter
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uint 83, label %letter
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uint 82, label %letter
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uint 81, label %letter
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uint 80, label %letter
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uint 79, label %letter
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uint 78, label %letter
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uint 77, label %letter
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uint 75, label %letter
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uint 74, label %letter
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uint 73, label %letter
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uint 72, label %letter
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uint 71, label %letter
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uint 70, label %letter
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uint 69, label %letter
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uint 68, label %letter
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uint 67, label %letter
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uint 66, label %letter
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uint 65, label %letter
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uint 64, label %label.13
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uint 76, label %label.12
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uint 36, label %label.11
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uint 4294967295, label %label.10
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]
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label.10: ; preds = %entry
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ret void
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label.11: ; preds = %entry
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ret void
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label.12: ; preds = %entry
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ret void
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label.13: ; preds = %entry
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ret void
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letter: ; preds = %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry
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ret void
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loopexit.2: ; preds = %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry
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switch int 0, label %shortcirc_next.14 [
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int 48, label %then.20
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int 46, label %endif.38
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]
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then.20: ; preds = %loopexit.2
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switch int 0, label %else.4 [
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int 120, label %then.21
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int 88, label %then.21
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]
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then.21: ; preds = %then.20, %then.20
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ret void
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else.4: ; preds = %then.20
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ret void
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shortcirc_next.14: ; preds = %loopexit.2
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ret void
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endif.38: ; preds = %loopexit.2
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br bool false, label %then.40, label %then.39
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then.39: ; preds = %endif.38
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ret void
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then.40: ; preds = %endif.38
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invoke void %__errno_location( )
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to label %switchexit.2 unwind label %LongJmpBlkPre
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loopentry.6: ; preds = %endif.52
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switch uint 0, label %switchexit.2 [
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uint 73, label %label.82
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uint 105, label %label.82
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uint 76, label %label.80
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uint 108, label %label.80
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uint 70, label %label.78
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uint 102, label %label.78
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]
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label.78: ; preds = %loopentry.6, %loopentry.6
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ret void
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label.80: ; preds = %loopentry.6, %loopentry.6
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ret void
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label.82: ; preds = %loopentry.6, %loopentry.6
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%c.0.15.5 = phi int [ %tmp.79417, %loopentry.6 ], [ %tmp.79417, %loopentry.6 ] ; <int> [#uses=0]
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ret void
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switchexit.2: ; preds = %then.40, %loopentry.6
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br bool false, label %endif.51, label %loopexit.6
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endif.51: ; preds = %switchexit.2
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br bool false, label %endif.52, label %then.52
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then.52: ; preds = %endif.51
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ret void
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endif.52: ; preds = %endif.51
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%tmp.79417 = invoke int %_IO_getc( )
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to label %loopentry.6 unwind label %LongJmpBlkPre ; <int> [#uses=2]
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loopexit.6: ; preds = %switchexit.2
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ret void
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char_constant: ; preds = %entry
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ret void
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string_constant: ; preds = %entry
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ret void
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combine: ; preds = %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry, %entry
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ret void
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label.126: ; preds = %entry
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ret void
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return: ; preds = %entry
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ret void
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LongJmpBlkPre: ; preds = %then.40, %endif.52
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ret void
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}
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