/*
* Load a class pointer value into a fixed or temp register. Target
* register is clobbered, and marked inUse.
*/
static ArmLIR *loadClassPointer(CompilationUnit *cUnit, int rDest, int value)
{
ArmLIR *res;
cUnit->hasClassLiterals = true;
if (dvmCompilerIsTemp(cUnit, rDest)) {
dvmCompilerClobber(cUnit, rDest);
dvmCompilerMarkInUse(cUnit, rDest);
}
ArmLIR *dataTarget = scanLiteralPool(cUnit->classPointerList, value, 0);
if (dataTarget == NULL) {
dataTarget = addWordData(cUnit, &cUnit->classPointerList, value);
/* Counts the number of class pointers in this translation */
cUnit->numClassPointers++;
}
ArmLIR *loadPcRel = (ArmLIR *) dvmCompilerNew(sizeof(ArmLIR), true);
loadPcRel->opcode = kThumbLdrPcRel;
loadPcRel->generic.target = (LIR *) dataTarget;
loadPcRel->operands[0] = rDest;
setupResourceMasks(loadPcRel);
setMemRefType(loadPcRel, true, kLiteral);
loadPcRel->aliasInfo = dataTarget->operands[0];
res = loadPcRel;
dvmCompilerAppendLIR(cUnit, (LIR *) loadPcRel);
return res;
}
/*
* Load a immediate using a shortcut if possible; otherwise
* grab from the per-translation literal pool. If target is
* a high register, build constant into a low register and copy.
*
* No additional register clobbering operation performed. Use this version when
* 1) rDest is freshly returned from dvmCompilerAllocTemp or
* 2) The codegen is under fixed register usage
*/
static ArmLIR *loadConstantNoClobber(CompilationUnit *cUnit, int rDest,
int value)
{
ArmLIR *res;
int tDest = LOWREG(rDest) ? rDest : dvmCompilerAllocTemp(cUnit);
/* See if the value can be constructed cheaply */
if ((value >= 0) && (value <= 255)) {
res = newLIR2(cUnit, kThumbMovImm, tDest, value);
if (rDest != tDest) {
opRegReg(cUnit, kOpMov, rDest, tDest);
dvmCompilerFreeTemp(cUnit, tDest);
}
return res;
} else if ((value & 0xFFFFFF00) == 0xFFFFFF00) {
res = newLIR2(cUnit, kThumbMovImm, tDest, ~value);
newLIR2(cUnit, kThumbMvn, tDest, tDest);
if (rDest != tDest) {
opRegReg(cUnit, kOpMov, rDest, tDest);
dvmCompilerFreeTemp(cUnit, tDest);
}
return res;
}
/* No shortcut - go ahead and use literal pool */
ArmLIR *dataTarget = scanLiteralPool(cUnit->literalList, value, 255);
if (dataTarget == NULL) {
dataTarget = addWordData(cUnit, &cUnit->literalList, value);
}
ArmLIR *loadPcRel = (ArmLIR *) dvmCompilerNew(sizeof(ArmLIR), true);
loadPcRel->opcode = kThumbLdrPcRel;
loadPcRel->generic.target = (LIR *) dataTarget;
loadPcRel->operands[0] = tDest;
setupResourceMasks(loadPcRel);
setMemRefType(loadPcRel, true, kLiteral);
loadPcRel->aliasInfo = dataTarget->operands[0];
res = loadPcRel;
dvmCompilerAppendLIR(cUnit, (LIR *) loadPcRel);
/*
* To save space in the constant pool, we use the ADD_RRI8 instruction to
* add up to 255 to an existing constant value.
*/
if (dataTarget->operands[0] != value) {
newLIR2(cUnit, kThumbAddRI8, tDest, value - dataTarget->operands[0]);
}
if (rDest != tDest) {
opRegReg(cUnit, kOpMov, rDest, tDest);
dvmCompilerFreeTemp(cUnit, tDest);
}
return res;
}
/* Add a 64-bit constant to the literal pool or mixed with code */
ArmLIR* addWideData(CompilationUnit* cUnit, LIR** constantListP,
int valLo, int valHi)
{
addWordData(cUnit, constantListP, valHi);
return addWordData(cUnit, constantListP, valLo);
}
