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Merge branch 'harmonica-iset' of https://github.com/cdkersey/harptool into harmonica-iset

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This commit is contained in:
chad
2014-09-26 07:22:33 -04:00
parent 28dc1743c9 dde43648fd
commit f544ca1e49
8 changed files with 158 additions and 59 deletions
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39
src/instruction.cpp
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@@ -81,6 +81,8 @@ Instruction::InstTableEntry Instruction::instTable[] = {
{"fdiv", false, false, false, false, AC_3REG, ITYPE_FPDIV },
{"fneg", false, false, false, false, AC_2REG, ITYPE_FPBASIC },
{"wspawn", false, false, true, false, AC_2REGSRC, ITYPE_NULL },
{"split", false, false, true, false, AC_NONE, ITYPE_NULL },
{"join", false, false, true, false, AC_NONE, ITYPE_NULL },
{NULL,false,false,false,false,AC_NONE,ITYPE_NULL}/////// End of table.
};
@@ -119,12 +121,16 @@ void Instruction::executeOn(Core &c) {
return;
}
/* Also throw exceptions on divergent branches. */
if (predicated && instTable[op].controlFlow) {
bool p0 = c.pred[0][pred];
for (Size t = 1; t < c.activeThreads; t++) {
if (c.pred[t][pred] != p0) throw DivergentBranchException();
/* Also throw exceptions on non-masked divergent branches. */
if (instTable[op].controlFlow) {
Size t, count, active;
for (t = 0, count = 0, active = 0; t < c.activeThreads; ++t) {
if ((!predicated || c.pred[t][pred]) && c.tmask[t]) ++count;
if (c.tmask[t]) ++active;
}
if (count != 0 && count != active)
throw DivergentBranchException();
}
Size nextActiveThreads = c.activeThreads;
@@ -133,8 +139,12 @@ void Instruction::executeOn(Core &c) {
for (Size t = 0; t < c.activeThreads; t++) {
vector<Reg<Word> > &reg(c.reg[t]);
vector<Reg<bool> > &pReg(c.pred[t]);
stack<DomStackEntry> &domStack(c.domStack);
if (predicated && !pReg[pred]) continue;
// If this thread is masked out, don't execute the instruction, unless it's
// a split or join.
if (((predicated && !pReg[pred]) || !c.tmask[t]) &&
op != SPLIT && op != JOIN) continue;
Word memAddr;
switch (op) {
@@ -288,6 +298,23 @@ void Instruction::executeOn(Core &c) {
case FDIV: reg[rdest] = Float(double(Float(reg[rsrc[0]], wordSz)) /
double(Float(reg[rsrc[1]], wordSz)),wordSz);
break;
case SPLIT:if (t == 0) {
// TODO: if mask becomes all-zero, fall through
DomStackEntry e(pred, c.pred, c.pc);
c.domStack.push(c.tmask);
c.domStack.push(e);
for (unsigned i = 0; i < e.tmask.size(); ++i)
c.tmask[i] = !e.tmask[i];
}
break;
case JOIN: if (t == 0) {
// TODO: if mask becomes all-zero, fall through
if (!c.domStack.top().fallThrough)
c.pc = c.domStack.top().pc;
c.tmask = c.domStack.top().tmask;
c.domStack.pop();
}
break;
default:
cout << "ERROR: Unsupported instruction: " << *this << "\n";
exit(1);