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a0ef9a3456
This is exchanging a sub-of-1 with add-of-minus-1: https://rise4fun.com/Alive/plKAH This is another step towards improving select-of-constants codegen (see D48970). x86 is the motivating target, and those diffs all appear to be wins. PPC and AArch64 look neutral. I've limited this to early combining (!LegalOperations) in case a target wants to reverse it, but I think canonicalizing to 'add' is more likely to produce further transforms because we have more folds for 'add'. Differential Revision: https://reviews.llvm.org/D49924 llvm-svn: 338317 |
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| BPF | ||
| Generic | ||
| Hexagon | ||
| Inputs | ||
| Lanai | ||
| Mips | ||
| MIR | ||
| MSP430 | ||
| Nios2 | ||
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| PowerPC | ||
| RISCV | ||
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| Thumb | ||
| Thumb2 | ||
| WebAssembly | ||
| WinCFGuard | ||
| WinEH | ||
| X86 | ||
| XCore | ||