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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-05-08 19:21:08 +0000 |
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| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-05-08 19:21:08 +0000 |
| commit | cf724f078623e786fc92335fdb0ec70b46f2e86d (patch) | |
| tree | 695dcf2a0e5a99fd98bf1d678bf5d3817d0cfd33 /website | |
| parent | f51190b6977ec1ae93be83fd109a3f99855bb653 (diff) | |
| download | llvm-cf724f078623e786fc92335fdb0ec70b46f2e86d.tar.gz llvm-cf724f078623e786fc92335fdb0ec70b46f2e86d.tar.bz2 llvm-cf724f078623e786fc92335fdb0ec70b46f2e86d.tar.xz | |
Remove an assertion to fix PR9872.
It can happen that a live debug variable is the last use of a sub-register, and
the register allocator will pick a larger register class for the virtual
register. If the allocated register doesn't support the sub-register index,
just use %noreg for the debug variables instead of asserting.
In PR9872, a debug variable ends up in the sub_8bit_hi part of a GR32_ABCD
register. The register is split and one part is inflated to GR32 and assigned
%ESI because there are no more normal uses of sub_8bit_hi.
Since %ESI doesn't have that sub-register, substPhysReg asserted. Now it will
simply insert a %noreg instead, and the debug variable will be marked
unavailable in that range.
We don't currently have a way of saying: !"value" is in bits 8-15 of %ESI, I
don't know if DWARF even supports that.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131073 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'website')
0 files changed, 0 insertions, 0 deletions