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Remove seemingly-unneeded artificial dependency

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The rationale for this artificial dependency seems to have been lost to the
ravages of time, it is covered by no regression tests, and has no impact on
test-suite performance numbers on either x86 or PPC.

For the test suite, on both x86 and PPC, I ran the test suite 10 times (both as
a baseline and with this change), and found no statistically-significant
changes.  For PPC, I used a P7 box. For x86, I used an Intel Xeon E5430. Both
with -O3 -mcpu=native.

This was discussed on-list back in January, but I've not had a chance to run
the performance tests until today.

llvm-svn: 206795
This commit is contained in:
Hal Finkel 2014-04-21 21:30:25 +00:00
parent c1753661ef
commit 9e0afff216
1 changed files with 0 additions and 5 deletions
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5
lib/CodeGen/ScheduleDAGInstrs.cpp
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@ -986,11 +986,6 @@ void ScheduleDAGInstrs::buildSchedGraph(AliasAnalysis *AA,
// we have lost all RejectMemNodes below barrier.
if (BarrierChain)
BarrierChain->addPred(SDep(SU, SDep::Barrier));
if (!ExitSU.isPred(SU))
// Push store's up a bit to avoid them getting in between cmp
// and branches.
ExitSU.addPred(SDep(SU, SDep::Artificial));
} else if (MI->mayLoad()) {
bool MayAlias = true;
if (MI->isInvariantLoad(AA)) {