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Do not track subregister liveness when it brings no benefits

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Some subregisters are only to indicate different access sizes, while not
providing any way to actually divide the register up into multiple
disjunct parts. Avoid tracking subregister liveness in these cases as it
is not beneficial.

Differential Revision: http://reviews.llvm.org/D8429

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232695 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2015-03-19 00:21:58 +00:00
parent cc690d62e3
commit 5101c89f13
11 changed files with 45 additions and 15 deletions
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2
lib/CodeGen/VirtRegMap.cpp
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@ -286,7 +286,7 @@ void VirtRegRewriter::addMBBLiveIns() {
}
void VirtRegRewriter::rewrite() {
bool NoSubRegLiveness = !MRI->tracksSubRegLiveness();
bool NoSubRegLiveness = !MRI->subRegLivenessEnabled();
SmallVector<unsigned, 8> SuperDeads;
SmallVector<unsigned, 8> SuperDefs;
SmallVector<unsigned, 8> SuperKills;