mirror of
https://github.com/c64scene-ar/llvm-6502.git
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a559a2317c
Take two disjoint Loops L1 and L2. LoopSimplify fails to simplify some loops (e.g. when indirect branches are involved). In such situations, it can happen that an exit for L1 is the header of L2. Thus, when we create PHIs in one of such exits we are also inserting PHIs in L2 header. This could break LCSSA form for L2 because these inserted PHIs can also have uses in L2 exits, which are never handled in the current implementation. Provide a fix for this corner case and test that we don't assert/crash on that. Differential Revision: http://reviews.llvm.org/D6624 rdar://problem/19166231 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224740 91177308-0d34-0410-b5e6-96231b3b80d8
575 lines
18 KiB
LLVM
575 lines
18 KiB
LLVM
; RUN: opt < %s -loop-simplify -lcssa -verify-loop-info -verify-dom-info -S | FileCheck %s
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; LCSSA should work correctly in the case of an indirectbr that exits
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; the loop, and the loop has exits with predecessors not within the loop
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; (and btw these edges are unsplittable due to the indirectbr).
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; PR5437
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define i32 @test0() nounwind {
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; CHECK-LABEL: @test0
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entry:
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br i1 undef, label %"4", label %"3"
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"3": ; preds = %entry
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ret i32 0
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"4": ; preds = %entry
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br i1 undef, label %"6", label %"5"
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"5": ; preds = %"4"
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unreachable
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"6": ; preds = %"4"
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br i1 undef, label %"10", label %"13"
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"10": ; preds = %"6"
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br i1 undef, label %"22", label %"15"
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"13": ; preds = %"6"
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unreachable
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"15": ; preds = %"23", %"10"
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unreachable
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"22": ; preds = %"10"
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br label %"23"
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"23": ; preds = %"1375", %"22"
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%0 = phi i32 [ undef, %"22" ], [ %1, %"1375" ] ; <i32> [#uses=1]
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indirectbr i8* undef, [label %"15", label %"24", label %"25", label %"26", label %"27", label %"28", label %"29", label %"30", label %"32", label %"32", label %"33", label %"167", label %"173", label %"173", label %"173", label %"173", label %"173", label %"192", label %"193", label %"194", label %"196", label %"206", label %"231", label %"241", label %"251", label %"261", label %"307", label %"353", label %"354", label %"355", label %"361", label %"367", label %"400", label %"433", label %"466", label %"499", label %"509", label %"519", label %"529", label %"571", label %"589", label %"607", label %"635", label %"655", label %"664", label %"671", label %"680", label %"687", label %"692", label %"698", label %"704", label %"715", label %"715", label %"716", label %"725", label %"725", label %"725", label %"725", label %"724", label %"724", label %"724", label %"724", label %"737", label %"737", label %"737", label %"737", label %"761", label %"758", label %"759", label %"760", label %"766", label %"763", label %"764", label %"765", label %"771", label %"768", label %"769", label %"770", label %"780", label %"777", label %"778", label %"779", label %"821", label %"826", label %"831", label %"832", label %"833", label %"836", label %"836", label %"886", label %"905", label %"978", label %"978", label %"1136", label %"1166", label %"1179", label %"1201", label %"1212", label %"1212", label %"1274", label %"1284", label %"1284", label %"1346", label %"1347", label %"1348", label %"1349", label %"1350", label %"1353", label %"1353", label %"1353", label %"1355", label %"1355", label %"1357", label %"1357", label %"1358", label %"1359", label %"1374", label %"1375", label %"1376", label %"1377", label %"1378", label %"1379", label %"1386", label %"1395", label %"1394", label %"1425", label %"1426", label %"1440", label %"1449", label %"1455", label %"1461", label %"1471", label %"1482", label %"1484", label %"1486", label %"1489", label %"1489", label %"1492", label %"1494", label %"1494", label %"1497", label %"1499", label %"1499", label %"1515", label %"1546", label %"1546", label %"1566", label %"1584", label %"1587", label %"1591", label %"1605", label %"1609", label %"1609", label %"1640", label %"1648", label %"1651", label %"1703", label %"1710", label %"1718", label %"1724", label %"1725", label %"1726", label %"1727", label %"1728", label %"1731", label %"1732", label %"1733", label %"1734", label %"1735", label %"1741", label %"1750", label %"1752", label %"1754", label %"1755", label %"1757", label %"1759", label %"1761", label %"1764", label %"1764", label %"1766", label %"1768", label %"1775", label %"1775", label %"1781", label %"1781", label %"1790", label %"1827", label %"1836", label %"1836", label %"1845", label %"1845", label %"1848", label %"1849", label %"1851", label %"1853", label %"1856", label %"1861", label %"1861"]
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"24": ; preds = %"23"
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unreachable
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"25": ; preds = %"23"
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unreachable
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"26": ; preds = %"23"
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unreachable
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"27": ; preds = %"23"
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unreachable
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"28": ; preds = %"23"
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unreachable
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"29": ; preds = %"23"
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unreachable
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"30": ; preds = %"23"
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unreachable
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"32": ; preds = %"23", %"23"
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unreachable
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"33": ; preds = %"23"
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unreachable
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"167": ; preds = %"23"
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unreachable
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"173": ; preds = %"23", %"23", %"23", %"23", %"23"
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unreachable
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"192": ; preds = %"23"
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unreachable
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"193": ; preds = %"23"
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unreachable
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"194": ; preds = %"23"
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unreachable
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"196": ; preds = %"23"
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unreachable
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"206": ; preds = %"23"
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unreachable
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"231": ; preds = %"23"
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unreachable
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"241": ; preds = %"23"
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unreachable
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"251": ; preds = %"23"
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unreachable
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"261": ; preds = %"23"
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unreachable
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"307": ; preds = %"23"
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unreachable
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"353": ; preds = %"23"
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unreachable
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"354": ; preds = %"23"
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unreachable
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"355": ; preds = %"23"
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unreachable
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"361": ; preds = %"23"
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unreachable
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"367": ; preds = %"23"
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unreachable
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"400": ; preds = %"23"
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unreachable
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"433": ; preds = %"23"
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unreachable
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"466": ; preds = %"23"
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unreachable
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"499": ; preds = %"23"
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unreachable
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"509": ; preds = %"23"
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unreachable
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"519": ; preds = %"23"
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unreachable
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"529": ; preds = %"23"
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unreachable
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"571": ; preds = %"23"
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unreachable
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"589": ; preds = %"23"
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unreachable
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"607": ; preds = %"23"
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unreachable
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"635": ; preds = %"23"
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unreachable
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"655": ; preds = %"23"
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unreachable
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"664": ; preds = %"23"
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unreachable
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"671": ; preds = %"23"
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unreachable
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"680": ; preds = %"23"
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unreachable
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"687": ; preds = %"23"
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unreachable
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"692": ; preds = %"23"
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br label %"1862"
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"698": ; preds = %"23"
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unreachable
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"704": ; preds = %"23"
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unreachable
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"715": ; preds = %"23", %"23"
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unreachable
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"716": ; preds = %"23"
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unreachable
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"724": ; preds = %"23", %"23", %"23", %"23"
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unreachable
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"725": ; preds = %"23", %"23", %"23", %"23"
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unreachable
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"737": ; preds = %"23", %"23", %"23", %"23"
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unreachable
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"758": ; preds = %"23"
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unreachable
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"759": ; preds = %"23"
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unreachable
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"760": ; preds = %"23"
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unreachable
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"761": ; preds = %"23"
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unreachable
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"763": ; preds = %"23"
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unreachable
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"764": ; preds = %"23"
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unreachable
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"765": ; preds = %"23"
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br label %"766"
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"766": ; preds = %"765", %"23"
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unreachable
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"768": ; preds = %"23"
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unreachable
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"769": ; preds = %"23"
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unreachable
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"770": ; preds = %"23"
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unreachable
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"771": ; preds = %"23"
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unreachable
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"777": ; preds = %"23"
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unreachable
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"778": ; preds = %"23"
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unreachable
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"779": ; preds = %"23"
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unreachable
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"780": ; preds = %"23"
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unreachable
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"821": ; preds = %"23"
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unreachable
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"826": ; preds = %"23"
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unreachable
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"831": ; preds = %"23"
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unreachable
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"832": ; preds = %"23"
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unreachable
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"833": ; preds = %"23"
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unreachable
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"836": ; preds = %"23", %"23"
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unreachable
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"886": ; preds = %"23"
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unreachable
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"905": ; preds = %"23"
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unreachable
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"978": ; preds = %"23", %"23"
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unreachable
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"1136": ; preds = %"23"
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unreachable
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"1166": ; preds = %"23"
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unreachable
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"1179": ; preds = %"23"
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unreachable
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"1201": ; preds = %"23"
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unreachable
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"1212": ; preds = %"23", %"23"
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unreachable
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"1274": ; preds = %"23"
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unreachable
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"1284": ; preds = %"23", %"23"
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unreachable
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"1346": ; preds = %"23"
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unreachable
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"1347": ; preds = %"23"
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unreachable
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"1348": ; preds = %"23"
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unreachable
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"1349": ; preds = %"23"
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unreachable
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"1350": ; preds = %"23"
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unreachable
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"1353": ; preds = %"23", %"23", %"23"
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unreachable
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"1355": ; preds = %"23", %"23"
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unreachable
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"1357": ; preds = %"23", %"23"
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unreachable
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"1358": ; preds = %"23"
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unreachable
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"1359": ; preds = %"23"
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unreachable
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"1374": ; preds = %"23"
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unreachable
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"1375": ; preds = %"23"
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%1 = zext i8 undef to i32 ; <i32> [#uses=1]
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br label %"23"
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"1376": ; preds = %"23"
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unreachable
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"1377": ; preds = %"23"
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unreachable
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"1378": ; preds = %"23"
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unreachable
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"1379": ; preds = %"23"
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unreachable
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"1386": ; preds = %"23"
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unreachable
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"1394": ; preds = %"23"
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unreachable
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"1395": ; preds = %"23"
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unreachable
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"1425": ; preds = %"23"
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unreachable
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"1426": ; preds = %"23"
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unreachable
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"1440": ; preds = %"23"
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unreachable
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"1449": ; preds = %"23"
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unreachable
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"1455": ; preds = %"23"
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unreachable
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"1461": ; preds = %"23"
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unreachable
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"1471": ; preds = %"23"
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unreachable
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"1482": ; preds = %"23"
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unreachable
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"1484": ; preds = %"23"
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unreachable
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"1486": ; preds = %"23"
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unreachable
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"1489": ; preds = %"23", %"23"
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unreachable
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"1492": ; preds = %"23"
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unreachable
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"1494": ; preds = %"23", %"23"
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unreachable
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"1497": ; preds = %"23"
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unreachable
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"1499": ; preds = %"23", %"23"
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unreachable
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"1515": ; preds = %"23"
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unreachable
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"1546": ; preds = %"23", %"23"
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unreachable
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"1566": ; preds = %"23"
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br i1 undef, label %"1569", label %"1568"
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"1568": ; preds = %"1566"
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unreachable
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"1569": ; preds = %"1566"
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unreachable
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"1584": ; preds = %"23"
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unreachable
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"1587": ; preds = %"23"
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unreachable
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"1591": ; preds = %"23"
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unreachable
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"1605": ; preds = %"23"
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unreachable
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"1609": ; preds = %"23", %"23"
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unreachable
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"1640": ; preds = %"23"
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unreachable
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"1648": ; preds = %"23"
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unreachable
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"1651": ; preds = %"23"
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unreachable
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"1703": ; preds = %"23"
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unreachable
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"1710": ; preds = %"23"
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unreachable
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"1718": ; preds = %"23"
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unreachable
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"1724": ; preds = %"23"
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unreachable
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"1725": ; preds = %"23"
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unreachable
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"1726": ; preds = %"23"
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unreachable
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"1727": ; preds = %"23"
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unreachable
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"1728": ; preds = %"23"
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unreachable
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"1731": ; preds = %"23"
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unreachable
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"1732": ; preds = %"23"
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unreachable
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"1733": ; preds = %"23"
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unreachable
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"1734": ; preds = %"23"
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unreachable
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"1735": ; preds = %"23"
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unreachable
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"1741": ; preds = %"23"
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unreachable
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"1750": ; preds = %"23"
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unreachable
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"1752": ; preds = %"23"
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unreachable
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"1754": ; preds = %"23"
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unreachable
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"1755": ; preds = %"23"
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unreachable
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"1757": ; preds = %"23"
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unreachable
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"1759": ; preds = %"23"
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unreachable
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"1761": ; preds = %"23"
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unreachable
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"1764": ; preds = %"23", %"23"
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%2 = icmp eq i32 %0, 168 ; <i1> [#uses=0]
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unreachable
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"1766": ; preds = %"23"
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unreachable
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"1768": ; preds = %"23"
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unreachable
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"1775": ; preds = %"23", %"23"
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unreachable
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"1781": ; preds = %"23", %"23"
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unreachable
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"1790": ; preds = %"23"
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unreachable
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"1827": ; preds = %"23"
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unreachable
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"1836": ; preds = %"23", %"23"
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br label %"1862"
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"1845": ; preds = %"23", %"23"
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unreachable
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"1848": ; preds = %"23"
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unreachable
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"1849": ; preds = %"23"
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unreachable
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"1851": ; preds = %"23"
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unreachable
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"1853": ; preds = %"23"
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unreachable
|
|
|
|
"1856": ; preds = %"23"
|
|
unreachable
|
|
|
|
"1861": ; preds = %"23", %"23"
|
|
unreachable
|
|
|
|
"41": ; preds = %"23", %"23"
|
|
unreachable
|
|
|
|
"1862": ; preds = %"1836", %"692"
|
|
unreachable
|
|
}
|
|
|
|
; An exit for Loop L1 may be the header of a disjoint Loop L2. Thus, when we
|
|
; create PHIs in one of such exits we are also inserting PHIs in L2 header. This
|
|
; could break LCSSA form for L2 because these inserted PHIs can also have uses
|
|
; in L2 exits. Test that we don't assert/crash on that.
|
|
define void @test1() {
|
|
; CHECK-LABEL: @test1
|
|
br label %lab1
|
|
|
|
lab1:
|
|
%tmp21 = add i32 undef, 677038203
|
|
br i1 undef, label %lab2, label %exit
|
|
|
|
lab2:
|
|
indirectbr i8* undef, [label %lab1, label %lab3]
|
|
|
|
lab3:
|
|
; CHECK: %tmp21.lcssa1 = phi i32 [ %tmp21.lcssa1, %lab4 ], [ %tmp21, %lab2 ]
|
|
%tmp12 = phi i32 [ %tmp21, %lab2 ], [ %tmp12, %lab4 ]
|
|
br i1 undef, label %lab5, label %lab4
|
|
|
|
lab4:
|
|
br label %lab3
|
|
|
|
lab5:
|
|
; CHECK: %tmp21.lcssa1.lcssa = phi i32 [ %tmp21.lcssa1, %lab3 ]
|
|
%tmp15 = add i32 %tmp12, undef
|
|
br label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|