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6 Commits

Author SHA1 Message Date
Clement Courbet 00b51bf123 add skylake 
llvm-svn: 300962
 2017-04-21 09:21:01 +00:00
Clement Courbet 2430e25ba3 add 32 bit tests 
llvm-svn: 300961
 2017-04-21 09:20:58 +00:00
Clement Courbet d5f6182bec use repmovsb when optimizing forminsize 
llvm-svn: 300960
 2017-04-21 09:20:55 +00:00
Clement Courbet 203fc17797 Rename FastString flag. 
llvm-svn: 300959
 2017-04-21 09:20:50 +00:00
Clement Courbet a7c233fbe0 add more tests 
llvm-svn: 300958
 2017-04-21 09:20:44 +00:00
Clement Courbet 1ce3b82dea X86 memcpy: use REPMOVSB instead of REPMOVS{Q,D,W} for inline copies 
when the subtarget has fast strings.

This has two advantages:
  - Speed is improved. For example, on Haswell thoughput improvements increase
    linearly with size from 256 to 512 bytes, after which they plateau:
    (e.g. 1% for 260 bytes, 25% for 400 bytes, 40% for 508 bytes).
  - Code is much smaller (no need to handle boundaries).

llvm-svn: 300957
 2017-04-21 09:20:39 +00:00