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b53cb9b938
This is the codegen part of fixing: https://bugs.llvm.org/show_bug.cgi?id=32939 Even with the optimal/canonical IR that is ideally created by D65954, we would reverse that transform in DAGCombiner and end up with the same asm on AArch64 or x86. I see 2 options for trying to correct this: 1. Limit isNegatibleForFree() by special-casing the fmul pattern (this patch). 2. Avoid creating (fmul X, 2.0) in the 1st place by adding a special-case transform to SelectionDAG::getNode() and/or SelectionDAGBuilder::visitFMul() that matches the transform done by DAGCombiner. This seems like the less intrusive patch, but if there's some other reason to prefer 1 option over the other, we can change to the other option. Differential Revision: https://reviews.llvm.org/D66016 llvm-svn: 368490 |
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| .. | ||
| Analysis | ||
| AsmParser | ||
| BinaryFormat | ||
| Bitcode | ||
| Bitstream | ||
| CodeGen | ||
| DebugInfo | ||
| Demangle | ||
| ExecutionEngine | ||
| Fuzzer | ||
| FuzzMutate | ||
| IR | ||
| IRReader | ||
| LineEditor | ||
| Linker | ||
| LTO | ||
| MC | ||
| MCA | ||
| Object | ||
| ObjectYAML | ||
| Option | ||
| Passes | ||
| ProfileData | ||
| Remarks | ||
| Support | ||
| TableGen | ||
| Target | ||
| Testing | ||
| TextAPI | ||
| ToolDrivers | ||
| Transforms | ||
| WindowsManifest | ||
| XRay | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||