Zapcc Is Showing Compile Times Even Faster Than LLVM Clang

Written by Michael Larabel in LLVM on 6 December 2015 at 12:32 PM EST. 19 Comments
The Zapcc compiler stack is proving to be faster than LLVM/Clang at compiling C++ codes, which in turn is much faster already than GCC. The performance of the generated binaries from this LLVM-based compiler stack is on-par with what's offered by Clang.

Back in May is when we first heard of Zapcc when they claimed to be a much faster C++ compiler. Since then, they've still been hard at work on this LLVM-based compiler being produced by Ceemple Software in Israel. They've invited me to benchmark Zapcc for comparison purposes and it's still on my never-ending TODO list, but today they shared they've uploaded some of their own benchmarks compared to Clang.

Over at are their own in-house benchmarks comparing Zapcc to Clang. Of course, they were using the Phoronix Test Suite for benchmarking. They also developed a number of new test profiles that I'll work to get upstreamed and available on shortly.

Ceemple's benchmark results show Zapcc to be significantly faster than LLVM Clang at compiling. In terms of the runtime performance, it's basically right on par with Clang.
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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