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2d3eb26eeb
Add a top-level STRTAB block containing a string table blob, and start storing strings for module codes FUNCTION, GLOBALVAR, ALIAS, IFUNC and COMDAT in the string table. This change allows us to share names between globals and comdats as well as between modules, and improves the efficiency of loading bitcode files by no longer using a bit encoding for symbol names. Once we start writing the irsymtab to the bitcode file we will also be able to share strings between it and the module. On my machine, link time for Chromium for Linux with ThinLTO decreases by about 7% for no-op incremental builds or about 1% for full builds. Total bitcode file size decreases by about 3%. As discussed on llvm-dev: http://lists.llvm.org/pipermail/llvm-dev/2017-April/111732.html Differential Revision: https://reviews.llvm.org/D31838 llvm-svn: 300464
40 lines
1.7 KiB
LLVM
40 lines
1.7 KiB
LLVM
; RUN: opt -module-summary %s -o %t1.bc
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; RUN: opt -module-summary %p/Inputs/distributed_indexes.ll -o %t2.bc
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; RUN: llvm-lto -thinlto-action=thinlink -o %t.index.bc %t1.bc %t2.bc
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; RUN: llvm-lto -thinlto-action=distributedindexes -thinlto-index %t.index.bc %t1.bc %t2.bc
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; RUN: llvm-bcanalyzer -dump %t1.bc.thinlto.bc | FileCheck %s --check-prefix=BACKEND1
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; RUN: llvm-bcanalyzer -dump %t2.bc.thinlto.bc | FileCheck %s --check-prefix=BACKEND2
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; The backend index for this module contains summaries from itself and
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; Inputs/distributed_indexes.ll, as it imports from the latter.
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; BACKEND1: <MODULE_STRTAB_BLOCK
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; BACKEND1-NEXT: <ENTRY {{.*}} record string = '{{.*}}distributed_indexes.ll.tmp{{.*}}.bc'
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; BACKEND1-NEXT: <ENTRY {{.*}} record string = '{{.*}}distributed_indexes.ll.tmp{{.*}}.bc'
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; BACKEND1-NEXT: </MODULE_STRTAB_BLOCK
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; BACKEND1-NEXT: <GLOBALVAL_SUMMARY_BLOCK
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; BACKEND1-NEXT: <VERSION
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; BACKEND1-NEXT: <VALUE_GUID op0={{1|2}} op1={{-3706093650706652785|-5300342847281564238}}
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; BACKEND1-NEXT: <VALUE_GUID op0={{1|2}} op1={{-3706093650706652785|-5300342847281564238}}
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; BACKEND1-NEXT: <COMBINED
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; BACKEND1-NEXT: <COMBINED
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; BACKEND1-NEXT: </GLOBALVAL_SUMMARY_BLOCK
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; The backend index for Input/distributed_indexes.ll contains summaries from
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; itself only, as it does not import anything.
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; BACKEND2: <MODULE_STRTAB_BLOCK
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; BACKEND2-NEXT: <ENTRY {{.*}} record string = '{{.*}}distributed_indexes.ll.tmp2.bc'
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; BACKEND2-NEXT: </MODULE_STRTAB_BLOCK
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; BACKEND2-NEXT: <GLOBALVAL_SUMMARY_BLOCK
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; BACKEND2-NEXT: <VERSION
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; BACKEND2-NEXT: <VALUE_GUID op0=1 op1=-5300342847281564238
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; BACKEND2-NEXT: <COMBINED
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; BACKEND2-NEXT: </GLOBALVAL_SUMMARY_BLOCK
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declare void @g(...)
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define void @f() {
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entry:
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call void (...) @g()
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ret void
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}
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