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| author | Evan Cheng <evan.cheng@apple.com> | 2008-03-19 00:52:20 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-03-19 00:52:20 +0000 |
| commit | 44c0b4f754fb2aada90aa88a57f5cd9b526a912a (patch) | |
| tree | d036fea823a17555ec2983c620f62602befc14f6 /clang/lib/CodeGen/CodeGenModule.cpp | |
| parent | af75ab81303cd875704ffbe4e4115badbcd6bd93 (diff) | |
| download | bcm5719-llvm-44c0b4f754fb2aada90aa88a57f5cd9b526a912a.tar.gz bcm5719-llvm-44c0b4f754fb2aada90aa88a57f5cd9b526a912a.zip | |
Fix live variables issues:
1. If part of a register is re-defined, an implicit kill and an implicit def are added to denote read / mod / write. However, this should only be necessary if the register is actually read later. This is a performance issue.
2. If a sub-register is being defined, and it doesn't have a previous use, do not add a implicit kill to the last use of a super-register:
= EAX, AX<imp-use,kill>
...
AX =
In this case, EAX is live but AX is killed, this is wrong and will cause the coalescer to do bad things.
llvm-svn: 48521
Diffstat (limited to 'clang/lib/CodeGen/CodeGenModule.cpp')
0 files changed, 0 insertions, 0 deletions
