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When looking for anti-dependences on the critical path, don't bother

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examining non-anti-dependence edges.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60496 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-12-03 19:32:26 +00:00
parent ebb0a31103
commit 0dba0e5408
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/PostRASchedulerList.cpp
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@ -195,6 +195,10 @@ bool SchedulePostRATDList::BreakAntiDependencies() {
SDep *Edge = CriticalPath[SU->NodeNum]; SDep *Edge = CriticalPath[SU->NodeNum];
SUnit *NextSU = Edge->Dep; SUnit *NextSU = Edge->Dep;
unsigned AntiDepReg = Edge->Reg; unsigned AntiDepReg = Edge->Reg;
// Only consider anti-dependence edges.
if (!Edge->isAntiDep)
continue;
assert(AntiDepReg != 0 && "Anti-dependence on reg0?");
// Don't break anti-dependencies on non-allocatable registers. // Don't break anti-dependencies on non-allocatable registers.
if (!AllocatableSet.test(AntiDepReg)) if (!AllocatableSet.test(AntiDepReg))
continue; continue;