Amara Emerson 04a6ea5d77 [GlobalISel] Add a combine for sext_inreg(load x), c --> sextload x ...

This is restricted to single use loads, which if we fold to sextloads we can
find more optimal addressing modes on AArch64.

This also fixes an overload the MachineFunction::getMachineMemOperand() method
which was incorrectly using the MF alignment instead of the MMO alignment.

Differential Revision: https://reviews.llvm.org/D85966

2020-08-18 10:42:15 -07:00

43 KiB

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