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Difference between revisions of "News:LLVM Targets"
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|Publication Date=2016/12/08 | |Publication Date=2016/12/08 | ||
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With =sys-devel/llvm-3.9.0 new <code> | With =sys-devel/llvm-3.9.0 new <code>LLVM_TARGETS</code> USE_EXPAND introduced which is relying on llvm's build system configuration for a specific microarchitecture host targets support[1,2]: | ||
* <code>AMDGPU</code> support for AMD & ATI graphic cards. | * <code>AMDGPU</code> support for AMD & ATI graphic cards. | ||
* <code>X86</code> support for 32-bit, 64-bit and x32 arch. (AMD64 and EMT64, respectively) | * <code>X86</code> support for 32-bit, 64-bit and x32 arch. (AMD64 and EMT64, respectively) | ||
Revision as of 07:36, December 8, 2016
LLVM Targets
With =sys-devel/llvm-3.9.0 new LLVM_TARGETS USE_EXPAND introduced which is relying on llvm's build system configuration for a specific microarchitecture host targets support[1,2]:
AMDGPUsupport for AMD & ATI graphic cards.X86support for 32-bit, 64-bit and x32 arch. (AMD64 and EMT64, respectively)BPFsupport for Berkley Packet Filtering.ARMsupport for ARM processors.NVPTXsupport for NVIDIA cards.
By default following targets enabled:
- 32- and 64-bit arch profiles:
X86,AMDGPU,BPFandNVPTX - arm profile:
ARMandBPF
Normally changing this settings is not recommended, however with llvm_targets it is now possible to control what microarchitecture support LLVM will be configured with, depending on hardware. For example, with NVIDIA cards, it make sense to leave only X86 and NVPTX targets, assuming that x86-compatible PC used. To achieve this, following changes in /etc/portage/make.conf needed:
/etc/portage/make.conf - Excerpt of make.conf with NVIDIA cardsLLVM_TARGETS="X86 NVPTX"