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Add unroll_disable and unroll_full loop control metacomments (#3260).

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Wilson Snyder
2024-01-26 07:49:07 -05:00
parent 94460867d3
commit d6f8ccd20b
19 changed files with 241 additions and 45 deletions
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src/V3LinkJump.cpp
+22 -4
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@@ -55,6 +55,7 @@ class LinkJumpVisitor final : public VNVisitor {
bool m_loopInc = false; // In loop increment
bool m_inFork = false; // Under fork
int m_modRepeatNum = 0; // Repeat counter
VOptionBool m_unrollFull; // Pragma full, disable, or default unrolling
std::vector<AstNodeBlock*> m_blockStack; // All begin blocks above current node
// METHODS
@@ -175,6 +176,7 @@ class LinkJumpVisitor final : public VNVisitor {
void visit(AstNodeBlock* nodep) override {
UINFO(8, " " << nodep << endl);
VL_RESTORER(m_inFork);
VL_RESTORER(m_unrollFull);
m_blockStack.push_back(nodep);
{
m_inFork = m_inFork || VN_IS(nodep, Fork);
@@ -182,6 +184,17 @@ class LinkJumpVisitor final : public VNVisitor {
}
m_blockStack.pop_back();
}
void visit(AstPragma* nodep) override {
if (nodep->pragType() == VPragmaType::UNROLL_DISABLE) {
m_unrollFull = VOptionBool::OPT_FALSE;
VL_DO_DANGLING(pushDeletep(nodep->unlinkFrBack()), nodep);
} else if (nodep->pragType() == VPragmaType::UNROLL_FULL) {
m_unrollFull = VOptionBool::OPT_TRUE;
VL_DO_DANGLING(pushDeletep(nodep->unlinkFrBack()), nodep);
} else {
iterateChildren(nodep);
}
}
void visit(AstRepeat* nodep) override {
// So later optimizations don't need to deal with them,
// REPEAT(count,body) -> loop=count,WHILE(loop>0) { body, loop-- }
@@ -205,14 +218,17 @@ class LinkJumpVisitor final : public VNVisitor {
nodep->fileline(), new AstVarRef{nodep->fileline(), varp, VAccess::READ}, zerosp};
AstNode* const bodysp = nodep->stmtsp();
if (bodysp) bodysp->unlinkFrBackWithNext();
AstNode* newp = new AstWhile{nodep->fileline(), condp, bodysp, decp};
initsp = initsp->addNext(newp);
newp = initsp;
nodep->replaceWith(newp);
AstWhile* const whilep = new AstWhile{nodep->fileline(), condp, bodysp, decp};
if (!m_unrollFull.isDefault()) whilep->unrollFull(m_unrollFull);
m_unrollFull = VOptionBool::OPT_DEFAULT_FALSE;
initsp = initsp->addNext(whilep);
nodep->replaceWith(initsp);
VL_DO_DANGLING(nodep->deleteTree(), nodep);
}
void visit(AstWhile* nodep) override {
// Don't need to track AstRepeat/AstFor as they have already been converted
if (!m_unrollFull.isDefault()) nodep->unrollFull(m_unrollFull);
m_unrollFull = VOptionBool::OPT_DEFAULT_FALSE;
VL_RESTORER(m_loopp);
VL_RESTORER(m_loopInc);
{
@@ -236,6 +252,8 @@ class LinkJumpVisitor final : public VNVisitor {
AstNodeExpr* const condp = nodep->condp() ? nodep->condp()->unlinkFrBack() : nullptr;
AstNode* const bodyp = nodep->stmtsp() ? nodep->stmtsp()->unlinkFrBack() : nullptr;
AstWhile* const whilep = new AstWhile{nodep->fileline(), condp, bodyp};
if (!m_unrollFull.isDefault()) whilep->unrollFull(m_unrollFull);
m_unrollFull = VOptionBool::OPT_DEFAULT_FALSE;
nodep->replaceWith(whilep);
VL_DO_DANGLING(nodep->deleteTree(), nodep);
if (bodyp) {