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| author | Evan Cheng <evan.cheng@apple.com> | 2010-10-20 22:03:58 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-10-20 22:03:58 +0000 |
| commit | 134982daa9bcd87f79c357e3a2686804b9baddd9 (patch) | |
| tree | a670e6100769156ad813fa680db31fe445c496e0 /lib/CodeGen/README.txt | |
| parent | e4d31593c5b0693480e697d7aeb0a24edcf53870 (diff) | |
| download | external_llvm-134982daa9bcd87f79c357e3a2686804b9baddd9.zip external_llvm-134982daa9bcd87f79c357e3a2686804b9baddd9.tar.gz external_llvm-134982daa9bcd87f79c357e3a2686804b9baddd9.tar.bz2 | |
More accurate estimate / tracking of register pressure.
- Initial register pressure in the loop should be all the live defs into the
loop. Not just those from loop preheader which is often empty.
- When an instruction is hoisted, update register pressure from loop preheader
to the original BB.
- Treat only use of a virtual register as kill since the code is still SSA.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116956 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/README.txt')
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