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Use critical anti-dep. breaking on all PPC targets, but also add other register classes.

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Using 'all' instead of 'critical' would be better because it would make it easier to
satisfy the bundling constraints, but, as noted in the FIXME, that is currently not
possible with the crs.

This yields an average 1% speedup over the entire test suite (on Power 7). Largest speedups:
SingleSource/Benchmarks/Shootout-C++/moments - 40%
MultiSource/Benchmarks/McCat/03-testtrie/testtrie - 28%
SingleSource/Benchmarks/BenchmarkGame/nsieve-bits - 26%
SingleSource/Benchmarks/McGill/misr - 23%
MultiSource/Applications/JM/ldecod/ldecod - 22%

Largest slowdowns:
SingleSource/Benchmarks/Shootout-C++/matrix - -29%
SingleSource/Benchmarks/Shootout-C++/ary3 - -22%
MultiSource/Benchmarks/BitBench/uuencode/uuencode - -18%
SingleSource/Benchmarks/Shootout-C++/ary - -17%
MultiSource/Benchmarks/MiBench/automotive-bitcount/automotive-bitcount - -15%

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158294 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2012-06-10 11:15:36 +00:00
parent cfd3ed9eaf
commit 01a90f4f8f
1 changed files with 11 additions and 4 deletions
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15
lib/Target/PowerPC/PPCSubtarget.cpp
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@ -146,10 +146,14 @@ bool PPCSubtarget::enablePostRAScheduler(
CodeGenOpt::Level OptLevel,
TargetSubtargetInfo::AntiDepBreakMode& Mode,
RegClassVector& CriticalPathRCs) const {
if (DarwinDirective == PPC::DIR_440 || DarwinDirective == PPC::DIR_A2)
Mode = TargetSubtargetInfo::ANTIDEP_ALL;
else
Mode = TargetSubtargetInfo::ANTIDEP_CRITICAL;
// FIXME: It would be best to use TargetSubtargetInfo::ANTIDEP_ALL here,
// but we can't because we can't reassign the cr registers. There is a
// dependence between the cr register and the RLWINM instruction used
// to extract its value which the anti-dependency breaker can't currently
// see. Maybe we should make a late-expanded pseudo to encode this dependency.
// (the relevant code is in PPCDAGToDAGISel::SelectSETCC)
Mode = TargetSubtargetInfo::ANTIDEP_CRITICAL;
CriticalPathRCs.clear();
@ -157,6 +161,9 @@ bool PPCSubtarget::enablePostRAScheduler(
CriticalPathRCs.push_back(&PPC::G8RCRegClass);
else
CriticalPathRCs.push_back(&PPC::GPRCRegClass);
CriticalPathRCs.push_back(&PPC::F8RCRegClass);
CriticalPathRCs.push_back(&PPC::VRRCRegClass);
return OptLevel >= CodeGenOpt::Default;
}