Mirko Brkusanin 36527cbe02 [AMDGPU][GlobalISel] Legalize memcpy family of intrinsics ...

Legalize G_MEMCPY, G_MEMMOVE, G_MEMSET and G_MEMCPY_INLINE.

Corresponding intrinsics are replaced by a loop that uses loads/stores in
AMDGPULowerIntrinsics pass unless their length is a constant lower then
MemIntrinsicExpandSizeThresholdOpt (default 1024). Any G_MEM* instruction that
reaches legalizer should have a const length argument and should be expanded
into appropriate number of loads + stores.

Differential Revision: https://reviews.llvm.org/D108357

2021-09-07 12:24:07 +02:00

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