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Another load-peephole optimization: do gcse when two loads are next to
each other. This implements InstCombine/load.ll:test9 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23322 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4926,13 +4926,16 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
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// None of the following transforms are legal for volatile loads.
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if (LI.isVolatile()) return 0;
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// If the instruction immediately before this is a store to the same address,
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// do a simple form of store->load forwarding.
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if (&LI.getParent()->front() != &LI) {
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BasicBlock::iterator BBI = &LI; --BBI;
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// If the instruction immediately before this is a store to the same
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// address, do a simple form of store->load forwarding.
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if (StoreInst *SI = dyn_cast<StoreInst>(BBI))
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if (SI->getOperand(1) == LI.getOperand(0))
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return ReplaceInstUsesWith(LI, SI->getOperand(0));
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if (LoadInst *LIB = dyn_cast<LoadInst>(BBI))
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if (LIB->getOperand(0) == LI.getOperand(0))
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return ReplaceInstUsesWith(LI, LIB);
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}
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if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(Op))
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