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Readme note 

llvm-svn: 27152
This commit is contained in:
Nate Begeman 2006-03-26 19:19:27 +00:00
parent 6961fc76bb
commit 68cc9d4540
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7
llvm/lib/Target/X86/README.txt
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@ -542,6 +542,13 @@ Currently the load folding imull has a higher complexity than the LEA32 pattern.
//===---------------------------------------------------------------------===//
We are currently lowering large (1MB+) memmove/memcpy to rep/stosl and rep/movsl
We should leave these as libcalls for everything over a much lower threshold,
since libc is hand tuned for medium and large mem ops (avoiding RFO for large
stores, TLB preheating, etc)
//===---------------------------------------------------------------------===//
Lower memcpy / memset to a series of SSE 128 bit move instructions when it's
feasible.