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cacc24d853
Summary: D69561/dde5893 enabled importing of readonly variables with references, however, it introduced a bug relating to importing/internalization of writeonly variables with references. A fix for this was added in D70006/7f92d66. But this didn't work in distributed ThinLTO mode. The reason is that the fix (importing the writeonly var with a zeroinitializer) was only applied when there were references on the writeonly var summary. In distributed ThinLTO mode, where we only have a small slice of the index, we will not have the references on the importing side if we are not importing those referenced values. Rather than changing this handshaking (which will require a lot of other changes, since that's how we know what to import in the distributed backend clang invocation), we can simply always give the writeonly variable a zero initializer. Reviewers: evgeny777, steven_wu Subscribers: mehdi_amini, inglorion, hiraditya, dexonsmith, arphaman, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D70977
39 lines
1.4 KiB
LLVM
39 lines
1.4 KiB
LLVM
; RUN: opt -thinlto-bc %s -o %t1
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; RUN: opt -thinlto-bc %p/Inputs/writeonly-with-refs.ll -o %t2
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; RUN: llvm-lto2 run -save-temps %t1 %t2 -o %t-out \
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; RUN: -r=%t1,main,plx \
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; RUN: -r=%t1,_Z3foov,l \
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; RUN: -r=%t2,_Z3foov,pl \
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; RUN: -r=%t2,outer,pl
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; @outer should have been internalized and converted to zeroinitilizer.
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; RUN: llvm-dis %t-out.1.3.import.bc -o - | FileCheck %s
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; RUN: llvm-dis %t-out.2.3.import.bc -o - | FileCheck %s
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; CHECK: @outer = internal local_unnamed_addr global %struct.Q zeroinitializer
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; Test again in distributed ThinLTO mode.
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; RUN: llvm-lto2 run -save-temps %t1 %t2 -o %t-out \
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; RUN: -thinlto-distributed-indexes \
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; RUN: -r=%t1,main,plx \
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; RUN: -r=%t1,_Z3foov,l \
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; RUN: -r=%t2,_Z3foov,pl \
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; RUN: -r=%t2,outer,pl
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; RUN: opt -function-import -import-all-index -enable-import-metadata -summary-file %t1.thinlto.bc %t1 -o %t1.out
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; RUN: opt -function-import -import-all-index -summary-file %t2.thinlto.bc %t2 -o %t2.out
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; RUN: llvm-dis %t1.out -o - | FileCheck %s
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; RUN: llvm-dis %t2.out -o - | FileCheck %s
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source_filename = "main.cpp"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: norecurse uwtable
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define dso_local i32 @main() local_unnamed_addr {
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entry:
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tail call void @_Z3foov()
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ret i32 0
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}
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declare dso_local void @_Z3foov() local_unnamed_addr
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