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ec4a2d665c
Summary: Emit summaries for bitcode modules that are only destined for the regular LTO portion of the build so they can participate in summary-based dead stripping. This change reduces the size of a nacl_helper build with cfi-icall enabled by 7%, removing the majority of the overhead due to enabling cfi-icall. The cfi-icall size increase was caused by compiling in lots of unused code and cfi-icall generating jumptable references to unused symbols that could no longer be removed by -Wl,-gc-sections. Increasing the visibility of summary-based dead stripping prevented jumptable entries being created for unused symbols from the regular LTO portion of the build. Reviewers: pcc Reviewed By: pcc Subscribers: dschuff, mehdi_amini, inglorion, eraman, llvm-commits, kcc Differential Revision: https://reviews.llvm.org/D47594 llvm-svn: 333768
35 lines
955 B
LLVM
35 lines
955 B
LLVM
; RUN: opt -thinlto-bc -thin-link-bitcode-file=%t2 -o %t %s
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; RUN: llvm-dis -o - %t | FileCheck %s
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; RUN: llvm-bcanalyzer -dump %t | FileCheck --check-prefix=BCA %s
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; When not splitting the module, the thin link bitcode file should simply be a
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; copy of the regular module.
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; RUN: diff %t %t2
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; BCA: <FULL_LTO_GLOBALVAL_SUMMARY_BLOCK
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; BCA-NOT: <GLOBALVAL_SUMMARY_BLOCK
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; CHECK: @llvm.global_ctors = appending global
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@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @f }]
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; CHECK: @g = internal global i8 42, !type !0
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@g = internal global i8 42, !type !0
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declare void @sink(i8*)
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; CHECK: define internal void @f()
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define internal void @f() {
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call void @sink(i8* @g)
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ret void
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}
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$h = comdat any
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; CHECK: define void @h() comdat
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define void @h() comdat {
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ret void
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}
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; CHECK: !llvm.module.flags = !{![[FLAG:[0-9]+]]}
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; CHECK: ![[FLAG]] = !{i32 1, !"ThinLTO", i32 0}
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!0 = !{i32 0, !"typeid"}
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