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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-05-07 22:57:55 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-05-07 22:57:55 +0000 |
| commit | defa0afa146f4c2370fe126b7860d6d57cf20909 (patch) | |
| tree | 04c6e7d4ac5458eb58cbe6b08f0a783a733111d8 /lib/Transforms/Utils/LoopUnrollRuntime.cpp | |
| parent | 7e56e92a33be7cc21a279e2fc6bd0e43833b1f18 (diff) | |
Coalesce subreg-subreg copies.
At least some of them:
%vreg1:sub_16bit = COPY %vreg2:sub_16bit; GR64:%vreg1, GR32: %vreg2
Previously, we couldn't figure out that the above copy could be
eliminated by coalescing %vreg2 with %vreg1:sub_32bit.
The new getCommonSuperRegClass() hook makes it possible.
This is not very useful yet since the unmodified part of the destination
register usually interferes with the source register. The coalescer
needs to understand sub-register interference checking first.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156334 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils/LoopUnrollRuntime.cpp')
0 files changed, 0 insertions, 0 deletions