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Replace one of burr scheduling heuristic with something more sensible. Now calcMaxScratches simply compute the number of true data dependencies. This actually improve a couple of tests in dejagnu suite as many tests in llvm nightly test suite.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64369 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-02-12 08:59:45 +00:00
parent e0a056b1ff
commit 8182347d70
3 changed files with 6 additions and 19 deletions
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22
lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
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@ -916,7 +916,7 @@ CalcNodeSethiUllmanNumber(const SUnit *SU, std::vector<unsigned> &SUNumbers) {
if (PredSethiUllman > SethiUllmanNumber) {
SethiUllmanNumber = PredSethiUllman;
Extra = 0;
} else if (PredSethiUllman == SethiUllmanNumber && !I->isCtrl())
} else if (PredSethiUllman == SethiUllmanNumber)
++Extra;
}
@ -1070,24 +1070,13 @@ static unsigned closestSucc(const SUnit *SU) {
}
/// calcMaxScratches - Returns an cost estimate of the worse case requirement
/// for scratch registers. Live-in operands and live-out results don't count
/// since they are "fixed".
/// for scratch registers, i.e. number of data dependencies.
static unsigned calcMaxScratches(const SUnit *SU) {
unsigned Scratches = 0;
for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I) {
I != E; ++I)
if (I->isCtrl()) continue; // ignore chain preds
if (!I->getSUnit()->getNode() ||
I->getSUnit()->getNode()->getOpcode() != ISD::CopyFromReg)
Scratches++;
}
for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I) {
if (I->isCtrl()) continue; // ignore chain succs
if (!I->getSUnit()->getNode() ||
I->getSUnit()->getNode()->getOpcode() != ISD::CopyToReg)
Scratches += 10;
}
return Scratches;
}
@ -1120,10 +1109,7 @@ bool bu_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const {
if (LDist != RDist)
return LDist < RDist;
// Intuitively, it's good to push down instructions whose results are
// liveout so their long live ranges won't conflict with other values
// which are needed inside the BB. Further prioritize liveout instructions
// by the number of operands which are calculated within the BB.
// How many registers becomes live when the node is scheduled.
unsigned LScratch = calcMaxScratches(left);
unsigned RScratch = calcMaxScratches(right);
if (LScratch != RScratch)

1
test/CodeGen/ARM/2008-11-19-ScavengerAssert.ll
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@ -1,4 +1,5 @@
; RUN: llvm-as < %s | llc -mtriple=arm-apple-darwin9
; RUN: llvm-as < %s | llc -mtriple=arm-apple-darwin9 -stats |& grep asm-printer | grep 186
%"struct.Adv5::Ekin<3>" = type <{ i8 }>
%"struct.Adv5::X::Energyflux<3>" = type { double }

2
test/CodeGen/X86/2008-08-05-SpillerBug.ll
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@ -1,4 +1,4 @@
; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin -disable-fp-elim -stats -info-output-file - | grep {Number of dead stores elided} | count 1
; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin -disable-fp-elim -stats |& grep asm-printer | grep 57
; PR2568
@g_3 = external global i16 ; <i16*> [#uses=1]