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8601cb2c88
Summary: The original assumption for the insertDef method was that it would not materialize Defs out of no-where, hence it will not insert phis needed after inserting a Def. However, when cloning an instruction (use case used in LICM), we do materialize Defs "out of no-where". If the block receiving a Def has at least one other Def, then no processing is needed. If the block just received its first Def, we must check where Phi placement is needed. The only new usage of insertDef is in LICM, hence the trigger for the bug. But the original goal of the method also fails to apply for the move() method. If we move a Def from the entry point of a diamond to either the left or right blocks, then the merge block must add a phi. While this usecase does not currently occur, or may be viewed as an incorrect transformation, MSSA must behave corectly given the scenario. Resolves PR40749 and PR40754. Reviewers: george.burgess.iv Subscribers: sanjoy, jlebar, Prazek, jdoerfert, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D58652 llvm-svn: 355040
59 lines
1.9 KiB
LLVM
59 lines
1.9 KiB
LLVM
; RUN: opt -licm -enable-mssa-loop-dependency -verify-memoryssa -S < %s | FileCheck %s
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; REQUIRES: asserts
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target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64"
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target triple = "systemz-unknown"
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@g_3 = external dso_local local_unnamed_addr global i32, align 4
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@g_57 = external dso_local local_unnamed_addr global i8, align 2
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@g_82 = external dso_local global [8 x i16], align 2
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@g_107 = external dso_local local_unnamed_addr global i32, align 4
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define internal fastcc void @foo1() unnamed_addr{
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; CHECK-LABEL: @foo1()
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entry:
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%.pre.pre = load i32, i32* @g_3, align 4
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br label %loop1
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loop1:
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%tmp0 = phi i32 [ undef, %entry ], [ %var18.lcssa, %loopexit ]
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br label %preheader
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preheader:
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%indvars.iv = phi i64 [ 0, %loop1 ], [ %indvars.iv.next, %loop6 ]
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%phi18 = phi i32 [ %tmp0, %loop1 ], [ 0, %loop6 ]
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%phi87 = phi i32 [ 0, %loop1 ], [ %tmp7, %loop6 ]
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%tmp1 = getelementptr inbounds [8 x i16], [8 x i16]* @g_82, i64 0, i64 %indvars.iv
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%tmp2 = load i16, i16* %tmp1, align 2
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%tmp3 = trunc i16 %tmp2 to i8
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store i8 %tmp3, i8* @g_57, align 2
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store i32 8, i32* @g_107, align 4
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%tmp4 = icmp eq i32 %.pre.pre, 0
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%spec.select = select i1 %tmp4, i32 %phi18, i32 14
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%tmp5 = trunc i64 %indvars.iv to i32
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switch i32 %spec.select, label %loopexit [
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i32 0, label %loop6
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i32 14, label %loop9
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]
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loop6:
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%tmp7 = add nuw nsw i32 %phi87, 1
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%tmp8 = icmp ult i64 %indvars.iv.next, 6
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br i1 %tmp8, label %preheader, label %loop9
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loop9:
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%phi8.lcssa = phi i32 [ %tmp5, %preheader ], [ %tmp7, %loop6 ]
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%tmp10 = trunc i32 %phi8.lcssa to i8
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%tmp11 = tail call i16* @func_101(i16* getelementptr inbounds ([8 x i16], [8 x i16]* @g_82, i64 0, i64 6), i16* undef, i8 zeroext %tmp10)
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unreachable
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loopexit:
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%var18.lcssa = phi i32 [ %phi18, %preheader ]
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br label %loop1
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}
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declare dso_local i16* @func_101(i16*, i16*, i8) local_unnamed_addr
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