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
122 lines
4.8 KiB
LLVM
122 lines
4.8 KiB
LLVM
; REQUIRES: x86
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; RUN: rm -rf %t; split-file %s %t
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;; Mostly copied/updated from thinlto-index-only.ll
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;; First ensure that the ThinLTO handling in lld handles
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;; bitcode without summary sections gracefully and generates index file.
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; RUN: llvm-as %t/f.ll -o %t/1.o
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; RUN: llvm-as %t/g.ll -o %t/2.o
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; RUN: %lld --thinlto-emit-index-files -dylib %t/1.o %t/2.o -o %t/3
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; RUN: ls %t/2.o.thinlto.bc
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; RUN: ls %t/3
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; RUN: %lld -dylib %t/1.o %t/2.o -o %t/3
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; RUN: llvm-nm %t/3 | FileCheck %s --check-prefix=NM
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;; Basic ThinLTO tests.
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; RUN: opt -module-summary %t/f.ll -o %t/1.o
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; RUN: opt -module-summary %t/g.ll -o %t/2.o
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; RUN: opt -module-summary %t/empty.ll -o %t/3.o
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;; Ensure lld generates an index and also a binary if requested.
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; RUN: %lld --thinlto-emit-index-files -dylib %t/1.o %t/2.o -o %t/4
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; RUN: llvm-bcanalyzer -dump %t/1.o.thinlto.bc | FileCheck %s -DP1=%t/1.o -DP2=%t/2.o --check-prefix=BACKEND1
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; RUN: llvm-bcanalyzer -dump %t/2.o.thinlto.bc | FileCheck %s -DP2=%t/2.o --check-prefix=BACKEND2
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; RUN: ls %t/4
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;; Ensure lld generates an index and not a binary if both emit-index and index-only are present.
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; RUN: %lld --thinlto-emit-index-files --thinlto-index-only -dylib %t/1.o %t/2.o -o %t/5
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; RUN: not ls %t/5
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;; Ensure lld generates an index even if the file is wrapped in --start-lib/--end-lib
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; RUN: rm -f %t/2.o.thinlto.bc
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; RUN: %lld --thinlto-emit-index-files -dylib %t/1.o %t/3.o --start-lib %t/2.o --end-lib -o %t/6
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; RUN: llvm-dis < %t/2.o.thinlto.bc | grep -q '\^0 = module:'
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; RUN: ls %t/6
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;; Test that LLD generates an empty index even for lazy object file that is not added to link.
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;; Test that LLD also generates empty imports file with the --thinlto-emit-imports-files option.
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; RUN: rm -f %t/1.o.thinlto.bc %t/1.o.imports
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; RUN: %lld --thinlto-emit-index-files -dylib %t/2.o --start-lib %t/1.o --end-lib \
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; RUN: --thinlto-emit-imports-files -o %t/7
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; RUN: ls %t/7
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; RUN: ls %t/1.o.thinlto.bc
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; RUN: ls %t/1.o.imports
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;; Ensure LLD generates an empty index for each bitcode file even if all bitcode files are lazy.
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; RUN: rm -f %t/dummy.o %t/1.o.thinlto.bc
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; RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin /dev/null -o %t/dummy.o
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; RUN: %lld --thinlto-emit-index-files -dylib %t/dummy.o --start-lib %t/1.o --end-lib -o %t/8
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; RUN: ls %t/8
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; RUN: ls %t/1.o.thinlto.bc
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;; Test that LLD errors out when run with suffix replacement, or prefix replacement
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; RUN: not %lld --thinlto-emit-index-files -dylib %t/2.o --start-lib %t/1.o --end-lib \
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; RUN: --thinlto-prefix-replace="abc;xyz" 2>&1 | FileCheck %s --check-prefix=ERR1
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; ERR1: --thinlto-prefix-replace is not supported with --thinlto-emit-index-files
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; RUN: not %lld --thinlto-emit-index-files -dylib %t/2.o --start-lib %t/1.o --end-lib \
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; RUN: --thinlto-object-suffix-replace="abc;xyz" 2>&1 | FileCheck %s --check-prefix=ERR2
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; ERR2: --thinlto-object-suffix-replace is not supported with --thinlto-emit-index-files
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;; But not when passed with index only as well
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; RUN: %lld --thinlto-emit-index-files -dylib %t/2.o --start-lib %t/1.o --end-lib \
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; RUN: --thinlto-prefix-replace="abc;xyz" --thinlto-index-only
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; RUN: %lld --thinlto-emit-index-files -dylib %t/2.o --start-lib %t/1.o --end-lib \
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; RUN: --thinlto-object-suffix-replace="abc;xyz" --thinlto-index-only
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; NM: T _f
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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 = '[[P1]]'
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; BACKEND1-NEXT: <ENTRY {{.*}} record string = '[[P2]]'
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; BACKEND1-NEXT: </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={{-3706093650706652785|-5300342847281564238}}
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; BACKEND1: <VALUE_GUID op0={{1|2}} op1={{-3706093650706652785|-5300342847281564238}}
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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 = '[[P2]]'
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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: <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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;--- f.ll
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target datalayout = "e-m:o-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-apple-darwin"
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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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;--- g.ll
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target datalayout = "e-m:o-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-apple-darwin"
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define void @g() {
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entry:
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ret void
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}
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;--- empty.ll
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target datalayout = "e-m:o-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-apple-darwin"
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