Tim Northover c2f8956313 GlobalISel: introduce G_PTR_MASK to simplify alloca handling. ...

This instruction clears the low bits of a pointer without requiring (possibly
dodgy if pointers aren't ints) conversions to and from an integer. Since (as
far as I'm aware) all masks are statically known, the instruction takes an
immediate operand rather than a register to specify the mask.

llvm-svn: 295103

2017-02-14 20:56:18 +00:00

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