llvm-6502/2010-11-04-BigByval.ll at cad33c624edaeffc000654470ae74d58ae5cd043 - llvm-6502 - Applefritter: Git

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Duncan Sands 1e92ec6886 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118260 91177308-0d34-0410-b5e6-96231b3b80d8

2010-11-04 21:16:46 +00:00

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 ; RUN: llc < %s
 ; PR7170
 %big = type [131072 x i8]
 declare void @foo(%big* byval align 1)
 define void @bar(%big* byval align 1 %x) {
   call void @foo(%big* byval align 1 %x)
   ret void
 }