3adc6e0308
As pointed out in https://discourse.llvm.org/t/undeterministic-thin-index-file/69985, the block count added to distributed ThinLTO index files breaks incremental builds on ThinLTO - if any linked file has a different number of BBs, then the accumulated sum placed in the index files will change, causing all ThinLTO backend compiles to be redone. The block count is only used for scaling of partial sample profiles, and was added in D80403 for D79831. This patch simply removes this field from the index files of non partial sample profile compiles, which is NFC on the output of the compiler. We subsequently need to see if this can be removed for partial sample profiles without signficant performance loss, or redesigned in a way that does not destroy caching. Differential Revision: https://reviews.llvm.org/D148746
64 lines
2.5 KiB
LLVM
64 lines
2.5 KiB
LLVM
; REQUIRES: x86
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; Basic ThinLTO tests.
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; RUN: opt -thinlto-bc %s -o %t1.obj
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; RUN: opt -thinlto-bc %p/Inputs/thinlto.ll -o %t2.obj
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; RUN: opt -thinlto-bc %p/Inputs/thinlto-empty.ll -o %t3.obj
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; Ensure lld generates an index and not a binary if requested.
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; RUN: rm -f %t4.exe
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; RUN: lld-link -thinlto-index-only -entry:main %t1.obj %t2.obj -out:%t4.exe
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; RUN: llvm-bcanalyzer -dump %t1.obj.thinlto.bc | FileCheck %s --check-prefix=BACKEND1
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; RUN: llvm-bcanalyzer -dump %t2.obj.thinlto.bc | FileCheck %s --check-prefix=BACKEND2
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; RUN: not test -e %t4.exe
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; The backend index for this module contains summaries from itself and
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; Inputs/thinlto.ll, as it imports from the latter.
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; BACKEND1: <MODULE_STRTAB_BLOCK
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; BACKEND1-NEXT: <ENTRY {{.*}} record string = '{{.*}}thinlto-index-only.ll.tmp{{.*}}.obj'
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; BACKEND1: <ENTRY {{.*}} record string = '{{.*}}thinlto-index-only.ll.tmp{{.*}}.obj'
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; BACKEND1-NOT: <ENTRY
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; BACKEND1: </MODULE_STRTAB_BLOCK
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; BACKEND1: <GLOBALVAL_SUMMARY_BLOCK
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; BACKEND1: <VERSION
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; BACKEND1: <FLAGS
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; BACKEND1: <VALUE_GUID op0={{1|2}} op1={{-5300342847281564238|-2624081020897602054}}
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; BACKEND1: <VALUE_GUID op0={{1|2}} op1={{-5300342847281564238|-2624081020897602054}}
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; BACKEND1: <COMBINED
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; BACKEND1: <COMBINED
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; BACKEND1: </GLOBALVAL_SUMMARY_BLOCK
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; The backend index for Input/thinlto.ll contains summaries from itself only,
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; as it does not import anything.
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; BACKEND2: <MODULE_STRTAB_BLOCK
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; BACKEND2-NEXT: <ENTRY {{.*}} record string = '{{.*}}thinlto-index-only.ll.tmp2.obj'
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; BACKEND2-NOT: <ENTRY
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; BACKEND2: </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: <FLAGS
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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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; Thin archive tests. Check that the module paths point to the original files.
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; RUN: rm -rf %t
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; RUN: mkdir %t
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; RUN: opt -thinlto-bc -o %t/foo.obj < %s
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; RUN: opt -thinlto-bc -o %t/bar.obj < %p/Inputs/thinlto.ll
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; RUN: llvm-ar rcsT %t5.lib %t/bar.obj %t3.obj
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; RUN: lld-link -thinlto-index-only -entry:main %t/foo.obj %t5.lib
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; RUN: llvm-dis -o - %t/foo.obj.thinlto.bc | FileCheck %s --check-prefix=THINARCHIVE
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; THINARCHIVE: ^0 = module: (path: "{{.*}}foo.obj",
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; THINARCHIVE: ^1 = module: (path: "{{.*}}bar.obj",
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target datalayout = "e-m:w-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-windows-msvc19.0.24215"
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declare void @g(...)
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define void @main() {
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call void (...) @g()
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ret void
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}
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