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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28419 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2006-05-20 07:44:53 +00:00
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commit 0d23bc4666
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10
lib/Target/X86/README.txt
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@ -577,3 +577,13 @@ nicer, while still handling the hard cases.
//===---------------------------------------------------------------------===//
Some ideas for instruction selection code simplification: 1. A pre-pass to
determine which chain producing node can or cannot be folded. The generated
isel code would then use the information. 2. The same pre-pass can force
ordering of TokenFactor operands to allow load / store folding. 3. During isel,
instead of recursively going up the chain operand chain, mark the chain operand
as available and put it in some work list. Select other nodes in the normal
manner. The chain operands are selected after all other nodes are selected. Uses
of chain nodes are modified after instruction selection is completed.