https://bugs.llvm.org/show_bug.cgi?id=43247
Bug ID: 43247
Summary: Long live ranges of constants don't get rematerialized
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Register Allocator
Assignee: unassignedb...@nondot.org
Reporter: aemer...@apple.com
CC: llvm-bugs@lists.llvm.org, quentin.colom...@gmail.com
We're enabling the localizer pass for optimizations in AArch64 GlobalISel,
which is a pass that tries to duplicate and move defs of constant-like
instructions close to their uses, so as to reduce the live ranges and register
pressure.
It would be good if the greedy register allocator could handle this problem for
us, but it seems to have been written with only SelectionDAG in mind which is
always block-local and doesn't have any notion of live range in its graph
representation.
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