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5 Commits

Author SHA1 Message Date
Duncan Sands 98512315f7 When passing a huge parameter using the byval mechanism, a long 
sequence of loads and stores was being generated to perform the
copy on the x86 targets if the parameter was less than 4 byte
aligned, causing llc to use up vast amounts of memory and time.
Use a "rep movs" form instead.  PR7170.

llvm-svn: 118260
 2010-11-04 21:16:46 +00:00
Chris Lattner 4470c2bb23 Fix a bug where the x86 backend would lower memcpy/memset of segment relative operations 
into non-segment-relative copies.

llvm-svn: 114402
 2010-09-21 05:43:34 +00:00
Chris Lattner 2510de2bea reimplement memcpy/memmove/memset lowering to use MachinePointerInfo 
instead of srcvalue/offset pairs.  This corrects SV info for mem 
operations whose size is > 32-bits.

llvm-svn: 114401
 2010-09-21 05:40:29 +00:00
Dan Gohman bb919dfb6b Implement a bunch more TargetSelectionDAGInfo infrastructure. 
Move EmitTargetCodeForMemcpy, EmitTargetCodeForMemset, and
EmitTargetCodeForMemmove out of TargetLowering and into
SelectionDAGInfo to exercise this.

llvm-svn: 103481
 2010-05-11 17:31:57 +00:00
Dan Gohman 9becdddc49 Add skeleton target-specific SelectionDAGInfo files. 
llvm-svn: 101564
 2010-04-16 23:04:22 +00:00