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bf62cde86e
Previously, BranchProbabilityInfo::calcLoopBranchHeuristics would determine the weights of basic blocks inside loops even when it didn't have enough information to estimate the branch probabilities correctly. This patch fixes the function to exit early if it doesn't see any exit edges or back edges and let the later heuristics determine the weights. This fixes PR18705 and <rdar://problem/15991090>. Differential Revision: http://reviews.llvm.org/D3363 llvm-svn: 206194
64 lines
1.9 KiB
LLVM
64 lines
1.9 KiB
LLVM
; RUN: llc < %s -mtriple=armv4t--linux-androideabi -print-machineinstrs=if-converter -o /dev/null 2>&1 | FileCheck %s
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; Fix a bug triggered in IfConverterTriangle when CvtBB has multiple
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; predecessors.
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; PR18752
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%classK = type { i8, %classF }
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%classF = type { i8 }
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%classL = type { %classG, i32, i32 }
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%classG = type { %classL* }
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%classM2 = type { %classL }
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define zeroext i1 @test(%classK* %this, %classM2* nocapture readnone %p1, %classM2* nocapture readnone %p2) align 2 {
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entry:
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br i1 undef, label %for.end, label %for.body
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; Before if conversion, we have
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; for.body -> lor.lhs.false.i (62)
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; -> for.cond.backedge (62)
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; lor.lhs.false.i -> for.cond.backedge (1048575)
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; -> cond.false.i (1)
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; Afer if conversion, we have
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; for.body -> for.cond.backedge (130023362)
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; -> cond.false.i (62)
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; CHECK: BB#1: derived from LLVM BB %for.body
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; CHECK: Successors according to CFG: BB#2(130023362) BB#4(62)
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for.body:
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br i1 undef, label %for.cond.backedge, label %lor.lhs.false.i, !prof !1
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for.cond.backedge:
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%tobool = icmp eq %classL* undef, null
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br i1 %tobool, label %for.end, label %for.body
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lor.lhs.false.i:
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%tobool.i.i7 = icmp eq i32 undef, 0
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br i1 %tobool.i.i7, label %for.cond.backedge, label %cond.false.i
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cond.false.i:
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call void @_Z3fn1v()
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unreachable
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for.end:
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br i1 undef, label %if.else.i.i, label %if.then.i.i
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if.then.i.i:
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store %classL* null, %classL** undef, align 4
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br label %_ZN1M6spliceEv.exit
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if.else.i.i:
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store %classL* null, %classL** null, align 4
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br label %_ZN1M6spliceEv.exit
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_ZN1M6spliceEv.exit:
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%LIS = getelementptr inbounds %classK* %this, i32 0, i32 1
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call void @_ZN1F10handleMoveEb(%classF* %LIS, i1 zeroext false)
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unreachable
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}
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declare %classL* @_ZN1M1JI1LS1_EcvPS1_Ev(%classM2*)
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declare void @_ZN1F10handleMoveEb(%classF*, i1 zeroext)
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declare void @_Z3fn1v()
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!0 = metadata !{metadata !"clang version 3.5"}
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!1 = metadata !{metadata !"branch_weights", i32 62, i32 62}
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