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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-07-25 17:15:15 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-07-25 17:15:15 +0000 |
| commit | 84315f03cb6127ac92a5b02239c6edc2a347069a (patch) | |
| tree | 301ffcca64721f24755950b2d5f6295e542c88f3 /LICENSE.TXT | |
| parent | 242204784bae63da503c2f509a38c532085f0eb1 (diff) | |
| download | external_llvm-84315f03cb6127ac92a5b02239c6edc2a347069a.zip external_llvm-84315f03cb6127ac92a5b02239c6edc2a347069a.tar.gz external_llvm-84315f03cb6127ac92a5b02239c6edc2a347069a.tar.bz2 | |
Preserve 2-addr constraints in ConnectedVNInfoEqClasses.
When a live range splits into multiple connected components, we would
arbitrarily assign <undef> uses to component 0. This is wrong when the
use is tied to a def that gets assigned to a different component:
%vreg69<def> = ADD8ri %vreg68<undef>, 1
The use and def must get the same virtual register.
Fix this by assigning <undef> uses to the same component as the value
defined by the instruction, if any:
%vreg69<def> = ADD8ri %vreg69<undef>, 1
This fixes PR13402. The PR has a test case which I am not including
because it is unlikely to keep exposing this behavior in the future.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160739 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'LICENSE.TXT')
0 files changed, 0 insertions, 0 deletions