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c4b356568b
manages to form a VSELECT with a non-i1 element type condition. Those are technically allowed in SDAG (at least, the generic type legalization logic will form them and I wouldn't want to try to audit everything te preclude forming them) so we need to be able to lower them. This isn't too hard to implement. We mark VSELECT as custom so we get a chance in C++, add a fast path for i1 conditions to get directly handled by the patterns, and a fallback when we need to manually force the condition to be an i1 that uses the vptestm instruction to turn a non-mask into a mask. This, unsurprisingly, generates awful code. But it at least doesn't crash. This was actually impacting open source packages built with LLVM for AVX-512 in the wild, so quickly landing a patch that at least stops the immediate bleeding. I think I've found where to fix the codegen quality issue, but less confident of that change so separating it out from the thing that doesn't change the result of any existing test case but causes mine to not crash. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302785 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| llvm.spec.in | ||
| LLVMBuild.txt | ||
| README.txt | ||
| RELEASE_TESTERS.TXT | ||
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you are writing a package for LLVM, see docs/Packaging.rst for our suggestions.