2019-07-05 17:25:05 +02:00
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; 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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[ThinLTO] Fix importing of writeonly variables in distributed ThinLTO
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
2019-12-03 21:22:51 +01:00
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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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2019-07-05 17:25:05 +02:00
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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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2019-09-11 01:15:38 +02:00
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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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2019-07-05 17:25:05 +02:00
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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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