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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-08-05 21:28:14 +0000 |
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| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-08-05 21:28:14 +0000 |
| commit | 5122467b386f64a3a672b72f2d34947432b312e7 (patch) | |
| tree | bfb19e6879568dbb13aa9a44634605e0e2f90a92 /clang/lib/Frontend/FrontendAction.cpp | |
| parent | a17ec9d84d06fcce9dc3746052c704d7f2682056 (diff) | |
| download | bcm5719-llvm-5122467b386f64a3a672b72f2d34947432b312e7.tar.gz bcm5719-llvm-5122467b386f64a3a672b72f2d34947432b312e7.zip | |
Detect proper register sub-classes.
Some instructions require restricted register classes, but most of the
time that doesn't affect register allocation. For example, some
instructions don't work with the stack pointer, but that is a reserved
register anyway.
Sometimes it matters, GR32_ABCD only has 4 allocatable registers. For
such a proper sub-class, the register allocator should try to enable
register class inflation since that makes more registers available for
allocation.
Make sure only legal super-classes are considered. For example, tGPR is
not a proper sub-class in Thumb mode, but in ARM mode it is.
llvm-svn: 136981
Diffstat (limited to 'clang/lib/Frontend/FrontendAction.cpp')
0 files changed, 0 insertions, 0 deletions
