mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-23 01:30:19 +00:00
LLVM backend for 6502
8def8d9263
The default implementation of getCmpSelInstrCost, which provides the cost of icmp/fcmp/select instructions, did not deal sensibly with illegal vector types that were scalarized. We'd ask for the legalization cost of the vector type, which would return something like (4, f64) given an input of <4 x double>, and we'd then check the TLI status of the ISD opcode on that scalar type. This would result in querying (ISD::VSELECT, f64), for example. Amusingly enough, ISD::VSELECT on scalar types is marked as Legal by default (as with most other operations), and most backends never change this because VSELECT is never generated on scalars. However, seeing the resulting operation as Legal, we'd neglect to add the scalarization cost before returning. The result is that we'd grossly under-estimate the cost of cmps/selects on illegal vector types. Now, if type legalization clearly results in scalarization, we skip the early return and add the scalarization cost. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217859 91177308-0d34-0410-b5e6-96231b3b80d8 |
||
|---|---|---|
| autoconf | ||
| bindings | ||
| cmake | ||
| docs | ||
| examples | ||
| include | ||
| lib | ||
| projects | ||
| test | ||
| tools | ||
| unittests | ||
| utils | ||
| .arcconfig | ||
| .clang-format | ||
| .clang-tidy | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| configure | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| llvm.spec.in | ||
| LLVMBuild.txt | ||
| Makefile | ||
| Makefile.common | ||
| Makefile.config.in | ||
| Makefile.rules | ||
| README.txt | ||
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, 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're writing a package for LLVM, see docs/Packaging.rst for our suggestions.