[llvm-dev] Byte-wide stores aren't coalesced if interspersed with other stores (original) (raw)
Andres Freund via llvm-dev llvm-dev at lists.llvm.org
Tue Sep 11 12:14:05 PDT 2018
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Hi,
On 2018-09-11 15:06:10 -0400, Nirav Davé wrote:
Hmm. This looks like the backend conservatively giving up early on merging.
It looks like you're running clang 5.02. There have been some improvements to the backend's memory aliasing and store merging that have landed since. Can you check if this is fixed in a newer version?
It's trunk at r341868. The clang version numbers come in from postgres' JIT infrastructure inlining SQL operators/functions, which are just taken from postgres' C code. I probably shouldn't have mixed versions in this installation, but it shouldn't affect the result, as that's only for the available_externally functions. The rest of the IR is generated by directly emitting IR via IRBuilder.
- Andres
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