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llvm-project/llvm/test/tools/llvm-mca/X86/no-sched-model.s

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[llvm-mca] LLVM Machine Code Analyzer. llvm-mca is an LLVM based performance analysis tool that can be used to statically measure the performance of code, and to help triage potential problems with target scheduling models. llvm-mca uses information which is already available in LLVM (e.g. scheduling models) to statically measure the performance of machine code in a specific cpu. Performance is measured in terms of throughput as well as processor resource consumption. The tool currently works for processors with an out-of-order backend, for which there is a scheduling model available in LLVM. The main goal of this tool is not just to predict the performance of the code when run on the target, but also help with diagnosing potential performance issues. Given an assembly code sequence, llvm-mca estimates the IPC (instructions per cycle), as well as hardware resources pressure. The analysis and reporting style were mostly inspired by the IACA tool from Intel. This patch is related to the RFC on llvm-dev visible at this link: http://lists.llvm.org/pipermail/llvm-dev/2018-March/121490.html Differential Revision: https://reviews.llvm.org/D43951 llvm-svn: 326998
2018-03-08 21:05:02 +08:00
# RUN: not llvm-mca -mtriple=x86_64-unknown-unknown -mcpu=generic < %s 2>&1 | FileCheck %s
# CHECK: error: unable to find instruction-level scheduling information for target triple 'x86_64-unknown-unknown' and cpu 'generic'.