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| -rw-r--r-- | lib/Target/X86/README.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 34055ddafb..2b7989bbe0 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -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. + + |