AirReportUsedRegisters.cpp [plain text]
#include "config.h"
#include "AirReportUsedRegisters.h"
#if ENABLE(B3_JIT)
#include "AirArgInlines.h"
#include "AirCode.h"
#include "AirInstInlines.h"
#include "AirRegLiveness.h"
#include "AirPhaseScope.h"
namespace JSC { namespace B3 { namespace Air {
void reportUsedRegisters(Code& code)
{
PhaseScope phaseScope(code, "reportUsedRegisters");
static constexpr bool verbose = false;
if (verbose)
dataLog("Doing reportUsedRegisters on:\n", code);
RegLiveness liveness(code);
for (BasicBlock* block : code) {
if (verbose)
dataLog("Looking at: ", *block, "\n");
RegLiveness::LocalCalc localCalc(liveness, block);
for (unsigned instIndex = block->size(); instIndex--;) {
Inst& inst = block->at(instIndex);
if (verbose)
dataLog(" Looking at: ", inst, "\n");
if (!inst.hasNonArgEffects()) {
bool canDelete = true;
inst.forEachArg(
[&] (Arg& arg, Arg::Role role, Bank, Width) {
if (Arg::isEarlyDef(role)) {
if (verbose)
dataLog(" Cannot delete because of ", arg, "\n");
canDelete = false;
return;
}
if (!Arg::isLateDef(role))
return;
if (!arg.isReg()) {
if (verbose)
dataLog(" Cannot delete because arg is not reg: ", arg, "\n");
canDelete = false;
return;
}
if (localCalc.isLive(arg.reg())) {
if (verbose)
dataLog(" Cannot delete because arg is live: ", arg, "\n");
canDelete = false;
return;
}
});
if (canDelete)
inst = Inst();
}
if (inst.kind.opcode == Patch) {
RegisterSet registerSet;
for (Reg reg : localCalc.live())
registerSet.set(reg);
inst.reportUsedRegisters(registerSet);
}
localCalc.execute(instIndex);
}
block->insts().removeAllMatching(
[&] (const Inst& inst) -> bool {
return !inst;
});
}
if (verbose)
dataLog("After reportUsedRegisters:\n", code);
}
} } }
#endif // ENABLE(B3_JIT)