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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
51 lines
1.7 KiB
LLVM
51 lines
1.7 KiB
LLVM
; Check that we optimize out writeonly variables and corresponding stores.
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; This test uses llvm-lto2
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; RUN: opt -module-summary %s -o %t1.bc
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; RUN: opt -module-summary %p/Inputs/index-const-prop.ll -o %t2.bc
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; RUN: llvm-lto2 run %t1.bc %t2.bc -save-temps \
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; RUN: -r=%t2.bc,foo,pl \
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; RUN: -r=%t2.bc,bar,pl \
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; RUN: -r=%t2.bc,baz,pl \
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; RUN: -r=%t2.bc,rand, \
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; RUN: -r=%t2.bc,gBar,pl \
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; RUN: -r=%t1.bc,main,plx \
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; RUN: -r=%t1.bc,baz, \
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; RUN: -r=%t1.bc,gBar, \
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; RUN: -o %t3
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; RUN: llvm-dis %t3.1.3.import.bc -o - | FileCheck %s --check-prefix=IMPORT
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; RUN: llvm-dis %t3.1.5.precodegen.bc -o - | FileCheck %s --check-prefix=CODEGEN
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; Check that gFoo and gBar were eliminated from source module together
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; with corresponsing stores
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; RUN: llvm-dis %t3.2.5.precodegen.bc -o - | FileCheck %s --check-prefix=CODEGEN-SRC
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; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 0, align 4
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; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 0, align 4
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; IMPORT: !DICompileUnit({{.*}})
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; CODEGEN-NOT: gFoo
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; CODEGEN-NOT: gBar
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; CODEGEN: i32 @main
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; CODEGEN-NEXT: %1 = tail call i32 @rand()
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; CODEGEN-NEXT: %2 = tail call i32 @rand()
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; CODEGEN-NEXT: ret i32 0
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; CODEGEN-SRC-NOT: gFoo
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; CODEGEN-SRC-NOT: gBar
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; CODEGEN-SRC: void @baz()
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; CODEGEN-SRC-NEXT: %1 = tail call i32 @rand()
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; CODEGEN-SRC-NEXT: %2 = tail call i32 @rand()
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; CODEGEN-SRC-NEXT: ret void
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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-pc-linux-gnu"
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; We should be able to link external definition of gBar to its declaration
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@gBar = external global i32
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define i32 @main() local_unnamed_addr {
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tail call void @baz()
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ret i32 0
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}
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declare void @baz() local_unnamed_addr
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