Amara Emerson e20b91c265 [GlobalISel] Replace hard coded dynamic alloca handling with G_DYN_STACKALLOC. ...

This change moves the actual stack pointer manipulation into the legalizer,
available to targets via lower(). The codegen is slightly different because
we're using explicit masks instead of G_PTRMASK, and using G_SUB rather than
adding a negative amount via G_GEP.

Differential Revision: https://reviews.llvm.org/D66678

llvm-svn: 370104

2019-08-27 19:54:27 +00:00

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