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7602e1153a
This new JIT event listener supports generating profiling data for the linux 'perf' profiling tool, allowing it to generate function and instruction level profiles. Currently this functionality is not enabled by default, but must be enabled with LLVM_USE_PERF=yes. Given that the listener has no dependencies, it might be sensible to enable by default once the initial issues have been shaken out. I followed existing precedent in registering the listener by default in lli. Should there be a decision to enable this by default on linux, that should probably be changed. Please note that until https://reviews.llvm.org/D47343 is resolved, using this functionality with mcjit rather than orcjit will not reliably work. Disregarding the previous comment, here's an example: $ cat /tmp/expensive_loop.c bool stupid_isprime(uint64_t num) { if (num == 2) return true; if (num < 1 || num % 2 == 0) return false; for(uint64_t i = 3; i < num / 2; i+= 2) { if (num % i == 0) return false; } return true; } int main(int argc, char **argv) { int numprimes = 0; for (uint64_t num = argc; num < 100000; num++) { if (stupid_isprime(num)) numprimes++; } return numprimes; } $ clang -ggdb -S -c -emit-llvm /tmp/expensive_loop.c -o /tmp/expensive_loop.ll $ perf record -o perf.data -g -k 1 ./bin/lli -jit-kind=mcjit /tmp/expensive_loop.ll 1 $ perf inject --jit -i perf.data -o perf.jit.data $ perf report -i perf.jit.data - 92.59% lli jitted-5881-2.so [.] stupid_isprime stupid_isprime main llvm::MCJIT::runFunction llvm::ExecutionEngine::runFunctionAsMain main __libc_start_main 0x4bf6258d4c544155 + 0.85% lli ld-2.27.so [.] do_lookup_x And line-level annotations also work: │ for(uint64_t i = 3; i < num / 2; i+= 2) { │1 30: movq $0x3,-0x18(%rbp) 0.03 │1 38: mov -0x18(%rbp),%rax 0.03 │ mov -0x10(%rbp),%rcx │ shr $0x1,%rcx 3.63 │ ┌──cmp %rcx,%rax │ ├──jae 6f │ │ if (num % i == 0) 0.03 │ │ mov -0x10(%rbp),%rax │ │ xor %edx,%edx 89.00 │ │ divq -0x18(%rbp) │ │ cmp $0x0,%rdx 0.22 │ │↓ jne 5f │ │ return false; │ │ movb $0x0,-0x1(%rbp) │ │↓ jmp 73 │ │ } 3.22 │1 5f:│↓ jmp 61 │ │ for(uint64_t i = 3; i < num / 2; i+= 2) { Subscribers: mgorny, llvm-commits Differential Revision: https://reviews.llvm.org/D44892 llvm-svn: 337789
86 lines
3.2 KiB
CMake
86 lines
3.2 KiB
CMake
/*===------- llvm/Config/llvm-config.h - llvm configuration -------*- C -*-===*/
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/* */
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/* The LLVM Compiler Infrastructure */
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/* */
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/* This file is distributed under the University of Illinois Open Source */
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/* License. See LICENSE.TXT for details. */
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/* */
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/*===----------------------------------------------------------------------===*/
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/* This file enumerates variables from the LLVM configuration so that they
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can be in exported headers and won't override package specific directives.
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This is a C header that can be included in the llvm-c headers. */
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#ifndef LLVM_CONFIG_H
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#define LLVM_CONFIG_H
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/* Define if LLVM_ENABLE_DUMP is enabled */
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#cmakedefine LLVM_ENABLE_DUMP
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/* Define if we link Polly to the tools */
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#cmakedefine LINK_POLLY_INTO_TOOLS
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/* Target triple LLVM will generate code for by default */
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#cmakedefine LLVM_DEFAULT_TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}"
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/* Define if threads enabled */
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#cmakedefine01 LLVM_ENABLE_THREADS
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/* Has gcc/MSVC atomic intrinsics */
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#cmakedefine01 LLVM_HAS_ATOMICS
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/* Host triple LLVM will be executed on */
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#cmakedefine LLVM_HOST_TRIPLE "${LLVM_HOST_TRIPLE}"
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/* LLVM architecture name for the native architecture, if available */
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#cmakedefine LLVM_NATIVE_ARCH ${LLVM_NATIVE_ARCH}
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/* LLVM name for the native AsmParser init function, if available */
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#cmakedefine LLVM_NATIVE_ASMPARSER LLVMInitialize${LLVM_NATIVE_ARCH}AsmParser
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/* LLVM name for the native AsmPrinter init function, if available */
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#cmakedefine LLVM_NATIVE_ASMPRINTER LLVMInitialize${LLVM_NATIVE_ARCH}AsmPrinter
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/* LLVM name for the native Disassembler init function, if available */
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#cmakedefine LLVM_NATIVE_DISASSEMBLER LLVMInitialize${LLVM_NATIVE_ARCH}Disassembler
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/* LLVM name for the native Target init function, if available */
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#cmakedefine LLVM_NATIVE_TARGET LLVMInitialize${LLVM_NATIVE_ARCH}Target
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/* LLVM name for the native TargetInfo init function, if available */
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#cmakedefine LLVM_NATIVE_TARGETINFO LLVMInitialize${LLVM_NATIVE_ARCH}TargetInfo
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/* LLVM name for the native target MC init function, if available */
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#cmakedefine LLVM_NATIVE_TARGETMC LLVMInitialize${LLVM_NATIVE_ARCH}TargetMC
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/* Define if this is Unixish platform */
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#cmakedefine LLVM_ON_UNIX ${LLVM_ON_UNIX}
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/* Define if we have the Intel JIT API runtime support library */
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#cmakedefine01 LLVM_USE_INTEL_JITEVENTS
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/* Define if we have the oprofile JIT-support library */
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#cmakedefine01 LLVM_USE_OPROFILE
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/* Define if we have the perf JIT-support library */
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#cmakedefine01 LLVM_USE_PERF
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/* Major version of the LLVM API */
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#define LLVM_VERSION_MAJOR ${LLVM_VERSION_MAJOR}
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/* Minor version of the LLVM API */
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#define LLVM_VERSION_MINOR ${LLVM_VERSION_MINOR}
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/* Patch version of the LLVM API */
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#define LLVM_VERSION_PATCH ${LLVM_VERSION_PATCH}
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/* LLVM version string */
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#define LLVM_VERSION_STRING "${PACKAGE_VERSION}"
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/* Whether LLVM records statistics for use with GetStatistics(),
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* PrintStatistics() or PrintStatisticsJSON()
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*/
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#cmakedefine01 LLVM_FORCE_ENABLE_STATS
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#endif
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