09158252f7
Before this patch, it wasn't possible to extend the ThinLTO threads to all SMT/CMT threads in the system. Only one thread per core was allowed, instructed by usage of llvm::heavyweight_hardware_concurrency() in the ThinLTO code. Any number passed to the LLD flag /opt:lldltojobs=..., or any other ThinLTO-specific flag, was previously interpreted in the context of llvm::heavyweight_hardware_concurrency(), which means SMT disabled. One can now say in LLD: /opt:lldltojobs=0 -- Use one std::thread / hardware core in the system (no SMT). Default value if flag not specified. /opt:lldltojobs=N -- Limit usage to N threads, regardless of usage of heavyweight_hardware_concurrency(). /opt:lldltojobs=all -- Use all hardware threads in the system. Equivalent to /opt:lldltojobs=$(nproc) on Linux and /opt:lldltojobs=%NUMBER_OF_PROCESSORS% on Windows. When an affinity mask is set for the process, threads will be created only for the cores selected by the mask. When N > number-of-hardware-threads-in-the-system, the threads in the thread pool will be dispatched equally on all CPU sockets (tested only on Windows). When N <= number-of-hardware-threads-on-a-CPU-socket, the threads will remain on the CPU socket where the process started (only on Windows). Differential Revision: https://reviews.llvm.org/D75153
35 lines
1.7 KiB
LLVM
35 lines
1.7 KiB
LLVM
; REQUIRES: x86
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; RUN: rm -fr %T/thinlto
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; RUN: mkdir %T/thinlto
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; RUN: opt -thinlto-bc -o %T/thinlto/main.obj %s
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; RUN: opt -thinlto-bc -o %T/thinlto/foo.obj %S/Inputs/lto-dep.ll
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; RUN: lld-link /lldsavetemps /out:%T/thinlto/main.exe /entry:main /subsystem:console %T/thinlto/main.obj %T/thinlto/foo.obj
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; RUN: llvm-nm %T/thinlto/main.exe1.lto.obj | FileCheck %s
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; Test various possible options for /opt:lldltojobs
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; RUN: lld-link /lldsavetemps /out:%T/thinlto/main.exe /entry:main /subsystem:console %T/thinlto/main.obj %T/thinlto/foo.obj /opt:lldltojobs=1
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; RUN: llvm-nm %T/thinlto/main.exe1.lto.obj | FileCheck %s
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; RUN: lld-link /lldsavetemps /out:%T/thinlto/main.exe /entry:main /subsystem:console %T/thinlto/main.obj %T/thinlto/foo.obj /opt:lldltojobs=all
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; RUN: llvm-nm %T/thinlto/main.exe1.lto.obj | FileCheck %s
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; RUN: lld-link /lldsavetemps /out:%T/thinlto/main.exe /entry:main /subsystem:console %T/thinlto/main.obj %T/thinlto/foo.obj /opt:lldltojobs=1000
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; RUN: llvm-nm %T/thinlto/main.exe1.lto.obj | FileCheck %s
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; RUN: not lld-link /lldsavetemps /out:%T/thinlto/main.exe /entry:main /subsystem:console %T/thinlto/main.obj %T/thinlto/foo.obj /opt:lldltojobs=foo 2>&1 | FileCheck %s --check-prefix=BAD-JOBS
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; BAD-JOBS: error: /opt:lldltojobs: invalid job count: foo
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; This command will store full path to foo.obj in the archive %t.lib
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; Check that /lldsavetemps is still usable in such case.
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; RUN: lld-link /lib %T/thinlto/foo.obj /out:%t.lib
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; RUN: lld-link /lldsavetemps /out:%t.exe /entry:main /subsystem:console %T/thinlto/main.obj %t.lib
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; CHECK-NOT: U foo
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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-msvc"
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define i32 @main() {
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call void @foo()
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ret i32 0
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}
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declare void @foo()
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