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reduce indentation, minor cleanups.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100042 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-03-31 20:32:51 +00:00
parent bbb88db993
commit 563d83ff53
1 changed files with 42 additions and 38 deletions
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80
lib/Target/X86/SSEDomainFix.cpp
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@ -25,7 +25,6 @@
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
@ -67,7 +66,7 @@ public:
}
};
/// A DomainValue is a bit like LiveIntervals' ValNo, but it laso keeps track
/// A DomainValue is a bit like LiveIntervals' ValNo, but it also keeps track
/// of execution domains.
///
/// An open DomainValue represents a set of instructions that can still switch
@ -168,7 +167,6 @@ private:
void visitGenericInstr(MachineInstr*);
void visitSoftInstr(MachineInstr*, unsigned mask);
void visitHardInstr(MachineInstr*, unsigned domain);
};
}
@ -286,22 +284,24 @@ void SSEDomainFixPass::enterBasicBlock() {
if (fi == LiveOuts.end()) continue;
DomainValue *pdv = fi->second[rx];
if (!pdv) continue;
if (!LiveRegs || !LiveRegs[rx])
if (!LiveRegs || !LiveRegs[rx]) {
SetLiveReg(rx, pdv);
else {
// We have a live DomainValue from more than one predecessor.
if (LiveRegs[rx]->collapsed()) {
// We are already collapsed, but predecessor is not. Force him.
if (!pdv->collapsed())
Collapse(pdv, LiveRegs[rx]->firstDomain());
} else {
// Currently open, merge in predecessor.
if (!pdv->collapsed())
Merge(LiveRegs[rx], pdv);
else
Collapse(LiveRegs[rx], pdv->firstDomain());
}
continue;
}
// We have a live DomainValue from more than one predecessor.
if (LiveRegs[rx]->collapsed()) {
// We are already collapsed, but predecessor is not. Force him.
if (!pdv->collapsed())
Collapse(pdv, LiveRegs[rx]->firstDomain());
continue;
}
// Currently open, merge in predecessor.
if (!pdv->collapsed())
Merge(LiveRegs[rx], pdv);
else
Collapse(LiveRegs[rx], pdv->firstDomain());
}
}
}
@ -338,21 +338,21 @@ void SSEDomainFixPass::visitSoftInstr(MachineInstr *mi, unsigned mask) {
if (LiveRegs)
for (unsigned i = mi->getDesc().getNumDefs(),
e = mi->getDesc().getNumOperands(); i != e; ++i) {
MachineOperand &mo = mi->getOperand(i);
if (!mo.isReg()) continue;
int rx = RegIndex(mo.getReg());
if (rx < 0) continue;
if (DomainValue *dv = LiveRegs[rx]) {
// Is it possible to use this collapsed register for free?
if (dv->collapsed()) {
if (unsigned m = collmask & dv->Mask)
collmask = m;
} else if (dv->compat(collmask))
used.push_back(rx);
else
Kill(rx);
MachineOperand &mo = mi->getOperand(i);
if (!mo.isReg()) continue;
int rx = RegIndex(mo.getReg());
if (rx < 0) continue;
if (DomainValue *dv = LiveRegs[rx]) {
// Is it possible to use this collapsed register for free?
if (dv->collapsed()) {
if (unsigned m = collmask & dv->Mask)
collmask = m;
} else if (dv->compat(collmask))
used.push_back(rx);
else
Kill(rx);
}
}
}
// If the collapsed operands force a single domain, propagate the collapse.
if (isPowerOf2_32(collmask)) {
@ -392,13 +392,17 @@ void SSEDomainFixPass::visitSoftInstr(MachineInstr *mi, unsigned mask) {
// priority to the latest ones.
DomainValue *dv = 0;
while (!doms.empty()) {
if (!dv)
dv = doms.back();
else if (!Merge(dv, doms.back()))
for (SmallVector<int,4>::iterator i=used.begin(), e=used.end(); i!=e; ++i)
if (LiveRegs[*i] == doms.back())
Kill(*i);
doms.pop_back();
if (!dv) {
dv = doms.pop_back_val();
continue;
}
DomainValue *ThisDV = doms.pop_back_val();
if (Merge(dv, ThisDV)) continue;
for (SmallVector<int,4>::iterator i=used.begin(), e=used.end(); i != e; ++i)
if (LiveRegs[*i] == ThisDV)
Kill(*i);
}
// dv is the DomainValue we are going to use for this instruction.