mirror of
https://github.com/c64scene-ar/llvm-6502.git
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1db071f0da
(X >s -1) ? C1 : C2 and (X <s 0) ? C2 : C1
into ((X >>s 31) & (C2 - C1)) + C1, avoiding the conditional.
This optimization could be extended to take non-const C1 and C2 but we better
stay conservative to avoid code size bloat for now.
for
int sel(int n) {
return n >= 0 ? 60 : 100;
}
we now generate
sarl $31, %edi
andl $40, %edi
leal 60(%rdi), %eax
instead of
testl %edi, %edi
movl $60, %ecx
movl $100, %eax
cmovnsl %ecx, %eax
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107866 91177308-0d34-0410-b5e6-96231b3b80d8
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| .. | ||
| ABCD | ||
| ADCE | ||
| ArgumentPromotion | ||
| BlockPlacement | ||
| BranchFolding | ||
| CodeExtractor | ||
| CodeGenPrepare | ||
| ConstantMerge | ||
| ConstProp | ||
| DeadArgElim | ||
| DeadStoreElimination | ||
| FunctionAttrs | ||
| GlobalDCE | ||
| GlobalOpt | ||
| GVN | ||
| IndVarSimplify | ||
| Inline | ||
| InstCombine | ||
| Internalize | ||
| IPConstantProp | ||
| JumpThreading | ||
| LCSSA | ||
| LICM | ||
| LoopDeletion | ||
| LoopIndexSplit | ||
| LoopRotate | ||
| LoopSimplify | ||
| LoopStrengthReduce | ||
| LoopUnroll | ||
| LoopUnswitch | ||
| LowerInvoke | ||
| LowerSetJmp | ||
| LowerSwitch | ||
| Mem2Reg | ||
| MemCpyOpt | ||
| MergeFunc | ||
| PartialSpecialize | ||
| PruneEH | ||
| Reassociate | ||
| ScalarRepl | ||
| SCCP | ||
| SimplifyCFG | ||
| SimplifyLibCalls | ||
| Sink | ||
| SRETPromotion | ||
| SSI | ||
| StripSymbols | ||
| TailCallElim | ||
| TailDup | ||