Jonas Paulsson e2ff20cbfa [SystemZ] implement shouldCoalesce() ...

Implement shouldCoalesce() to help regalloc avoid running out of GR128
registers.

If a COPY involving a subreg of a GR128 is coalesced, the live range of the
GR128 virtual register will be extended. If this happens where there are
enough phys-reg clobbers present, regalloc will run out of registers (if
there is not a single GR128 allocatable register available).

This patch tries to allow coalescing only when it can prove that this will be
safe by checking the (local) interval in question.

Review: Ulrich Weigand, Quentin Colombet
https://reviews.llvm.org/D37899
https://bugs.llvm.org/show_bug.cgi?id=34610

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314516 91177308-0d34-0410-b5e6-96231b3b80d8

2017-09-29 14:31:39 +00:00

..

llvm

[SystemZ] implement shouldCoalesce()

2017-09-29 14:31:39 +00:00

llvm-c

[ORC] Hook up the LLVMOrcAddObjectFile function in the Orc C Bindings.

2017-09-17 03:25:03 +00:00