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2ef57e636f
In various places we depend on compiler-defined macros like __x86_64__ to guard CPU-type-specific code. However, those macros aren't very well standardized; in particular, it emerges that MSVC doesn't define any of the ones gcc does, but has its own. We were not coping with that consistently, with the result that we're missing some useful CPU-dependent optimizations in MSVC builds. There are also some places that are checking randomly-different spellings that may have been the only ones recognized by some old compilers, but we weren't doing that consistently either. Let's standardize on using gcc's long-form spellings (with trailing underscores), after putting a stanza into c.h that ensures that these spellings are defined even when the compiler provides some other one. I put an "#else #error" branch into the c.h addition so that we'll get an error if the compiler provides none of the symbols we're expecting. That might be best removed in the end, since it might annoy people trying to port to some new CPU type. But for testing this it seems like a good idea, in case we've missed some common variant spelling. In addition to enabling some optimizations we previously missed on MSVC, this cleans up a thinko. Several places used "_M_X64" in the apparent belief that that's MSVC's equivalent to __x86_64__, but it's not: it will also get defined on some but not all ARM64 builds. Also, guard the x86_feature_available() stuff in pg_cpu.[hc] with #if defined(__x86_64__) || defined(__i386__) which seems like a more natural way of specifying what it applies to. This builds on some previous work by Thomas Munro, but it requires much less code churn because it re-uses gcc's names for the CPU-type macros instead of inventing our own. Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CA+hUKGL8Hs-phHPugrWM=5dAkcT897rXyazYzLw-Szxnzgx-rA@mail.gmail.com Discussion: https://postgr.es/m/3035145.1780503430@sss.pgh.pa.us |
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