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Author SHA1 Message Date
Kai Luo e2b93185b8 [PowerPC] Only make copies of registers on stack in variadic function when va_start is called 
On PPC64, for a variadic function, if va_start is not called, it won't
access any variadic argument on stack, thus we can save stores of
registers used to pass arguments.

Differential Revision: https://reviews.llvm.org/D82361
 2020-07-09 07:18:17 +00:00
QingShan Zhang 7fdb3a293b [PowerPC] Implement the areMemAccessesTriviallyDisjoint hook 
After implemented this hook, we will model the memory dependency in the scheduling dependency graph more precise,
and will have more opportunity to reorder the load/stores, as they didn't have the dependency at some condition

Differential Revision: https://reviews.llvm.org/D63804

llvm-svn: 364886
 2019-07-02 03:28:52 +00:00
Simon Pilgrim 83bacd8d72 [SelectionDAG] Legalize vaargs that require vector splitting 
This adds vector splitting for vaarg instructions during type legalization

Committed on behalf of @luke (Luke Lau)

Differential Revision: https://reviews.llvm.org/D60762

llvm-svn: 363671
 2019-06-18 12:24:02 +00:00