Similar to d39b4ce3ce8a3c256e01bdec2b140777a332a633
Using "eabi" or "gnueabi" for aarch64 targets is a common mistake and
warned by Clang Driver. We want to avoid them elsewhere as well. Just
use the common "aarch64" without other triple components.
PR #66334 tried to renumber slot indexes before register allocation, but
the numbering was still affected by list entries for instructions which
had been erased. Fix this to make the register allocator's live range
length heuristics even less dependent on the history of how instructions
have been added to and removed from SlotIndexes's maps.
This extends the existing legalization combine to fold G_BUILD_VECTOR where the
sources are all from the same G_UNMERGE, to handle cases where some of the
lanes are undef. This comes up in the legalization of <3 x ..> vectors in
AArch64, where they are padded with undef.
There are two choices for what to create. This patch just removes the
G_BUILD_VECTOR/G_UNMERGE, losing the information about which lanes are undef.
The alternative would be to generate an identity G_SHUFFLE_VECTOR with undef
lanes marked as undef. I think both have advantages and disadvantages.
Differential Revision: https://reviews.llvm.org/D158063
Refresh of the generic scheduling model to use A510 instead of A55.
Main benefits are to the little core, and introducing SVE scheduling information.
Changes tested on various OoO cores, no performance degradation is seen.
Differential Revision: https://reviews.llvm.org/D156799
