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| author | Eli Friedman <efriedma@codeaurora.org> | 2018-02-06 23:22:14 +0000 |
|---|---|---|
| committer | Eli Friedman <efriedma@codeaurora.org> | 2018-02-06 23:22:14 +0000 |
| commit | cd07a3e2f9e7c35e90f82bc33cfec0be59c27568 (patch) | |
| tree | 5d8f6d2039f4203f83a607798a314c0b07663799 /llvm/lib/Bitcode/Writer/BitcodeWriter.cpp | |
| parent | a3d37f071697771071addf2d9f2decad923de3ad (diff) | |
| download | llvm-cd07a3e2f9e7c35e90f82bc33cfec0be59c27568.zip llvm-cd07a3e2f9e7c35e90f82bc33cfec0be59c27568.tar.gz llvm-cd07a3e2f9e7c35e90f82bc33cfec0be59c27568.tar.bz2 | |
Place undefined globals in .bss instead of .data
Following up on the discussion from
http://lists.llvm.org/pipermail/llvm-dev/2017-April/112305.html, undef
values are now placed in the .bss as well as null values. This prevents
undef global values taking up potentially huge amounts of space in the
.data section.
The following two lines now both generate equivalent .bss data:
@vals1 = internal unnamed_addr global [20000000 x i32] zeroinitializer, align 4
@vals2 = internal unnamed_addr global [20000000 x i32] undef, align 4 ; previously unaccounted for
This is primarily motivated by the corresponding issue in the Rust
compiler (https://github.com/rust-lang/rust/issues/41315).
Differential Revision: https://reviews.llvm.org/D41705
Patch by varkor!
llvm-svn: 324424
Diffstat (limited to 'llvm/lib/Bitcode/Writer/BitcodeWriter.cpp')
0 files changed, 0 insertions, 0 deletions