diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-09-06 18:15:23 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-09-06 18:15:23 +0000 |
| commit | 45c5c57179e8b4938042431f8e12c9bfad67b3c8 (patch) | |
| tree | 028a8ab9a6720b6c1fe6c9b3a8b3eadbc531a428 /lib/CodeGen/MachineFunction.cpp | |
| parent | e617ccb80da76821379bbff4a2fdcd09e8401e8b (diff) | |
| download | llvm-45c5c57179e8b4938042431f8e12c9bfad67b3c8.tar.gz llvm-45c5c57179e8b4938042431f8e12c9bfad67b3c8.tar.bz2 llvm-45c5c57179e8b4938042431f8e12c9bfad67b3c8.tar.xz | |
Allow overlaps between virtreg and physreg live ranges.
The RegisterCoalescer understands overlapping live ranges where one
register is defined as a copy of the other. With this change, register
allocators using LiveRegMatrix can do the same, at least for copies
between physical and virtual registers.
When a physreg is defined by a copy from a virtreg, allow those live
ranges to overlap:
%CL<def> = COPY %vreg11:sub_8bit; GR32_ABCD:%vreg11
%vreg13<def,tied1> = SAR32rCL %vreg13<tied0>, %CL<imp-use,kill>
We can assign %vreg11 to %ECX, overlapping the live range of %CL.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163336 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineFunction.cpp')
0 files changed, 0 insertions, 0 deletions