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| author | Juergen Ributzka <juergen@apple.com> | 2013-12-14 06:53:06 +0000 |
|---|---|---|
| committer | Juergen Ributzka <juergen@apple.com> | 2013-12-14 06:53:06 +0000 |
| commit | aaecc0fc0898be1bdd0f5e6f67230cae559f61b8 (patch) | |
| tree | cf0d1f3e2dfe34a15ac348cf9a77a61bec741efe /lib/CodeGen/AsmPrinter/AsmPrinter.cpp | |
| parent | cdeccb0c224f8c5863ef769c582b2f7c3cbb043c (diff) | |
| download | llvm-aaecc0fc0898be1bdd0f5e6f67230cae559f61b8.tar.gz llvm-aaecc0fc0898be1bdd0f5e6f67230cae559f61b8.tar.bz2 llvm-aaecc0fc0898be1bdd0f5e6f67230cae559f61b8.tar.xz | |
[Stackmap] Liveness Analysis Pass
This optional register liveness analysis pass can be enabled with either
-enable-stackmap-liveness, -enable-patchpoint-liveness, or both. The pass
traverses each basic block in a machine function. For each basic block the
instructions are processed in reversed order and if a patchpoint or stackmap
instruction is encountered the current live-out register set is encoded as a
register mask and attached to the instruction.
Later on during stackmap generation the live-out register mask is processed and
also emitted as part of the stackmap.
This information is optional and intended for optimization purposes only. This
will enable a client of the stackmap to reason about the registers it can use
and which registers need to be preserved.
Reviewed by Andy
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197317 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/AsmPrinter/AsmPrinter.cpp')
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