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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27152 91177308-0d34-0410-b5e6-96231b3b80d8
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Nate Begeman 2006-03-26 19:19:27 +00:00
parent 6d92caddc4
commit c02e5a8668
1 changed files with 7 additions and 0 deletions
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7
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.