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Mirror of https://github.com/RPCS3/llvm-mirror
6fac6282c8
make some readability improvements. Both the check file and input file have to be fully buffered to normalize their whitespace. But previously this would be done in a stack SmallString and then copied into a heap allocated MemoryBuffer. That seems pretty wasteful, especially for something like FileCheck where there are only ever two such entities. This just rearranges the code so that we can keep the canonicalized buffers on the stack of the main function, use reasonably large stack buffers to reduce allocation. A rough estimate seems to show that about 80% of LLVM's .ll and .s files will fit into a 4k buffer, so this should completely avoid heap allocation for the buffer in those cases. My system's malloc is fast enough that the allocations don't directly show up in timings. However, on some very slow test cases, this saves 1% - 2% by avoiding the copy into the heap allocated buffer. This also splits out the code which checks the input into a helper much like the code to build the checks as that made the code much more readable to me. Nit picks and suggestions welcome here. It has really exposed a *bunch* of stuff that could be cleaned up though, so I'm probably going to go and spring clean all of this code as I have more changes coming to speed things up. llvm-svn: 289378 |
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| llvm.spec.in | ||
| LLVMBuild.txt | ||
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