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Use narrowest RedXor

This commit is contained in:
Geza Lore 2021-08-18 10:54:45 +01:00
parent 8f527a0c6e
commit fffc63970d
2 changed files with 10 additions and 4 deletions
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7
src/V3Cast.cpp
View File

@ -155,9 +155,10 @@ private:
}
}
virtual void visit(AstVarRef* nodep) override {
if (nodep->access().isReadOnly() && !VN_IS(nodep->backp(), CCast)
&& VN_IS(nodep->backp(), NodeMath) && !VN_IS(nodep->backp(), ArraySel)
&& nodep->backp()->width() && castSize(nodep) != castSize(nodep->varp())) {
AstNode* const backp = nodep->backp();
if (nodep->access().isReadOnly() && !VN_IS(backp, CCast) && VN_IS(backp, NodeMath)
&& !VN_IS(backp, ArraySel) && !VN_IS(backp, RedXor) && backp->width()
&& castSize(nodep) != castSize(nodep->varp())) {
// Cast vars to IData first, else below has upper bits wrongly set
// CData x=3; out = (QData)(x<<30);
insertCast(nodep, castSize(nodep));

7
src/V3EmitCFunc.h
View File

@ -975,8 +975,13 @@ public:
if (nodep->lhsp()->isWide()) {
visit(VN_CAST(nodep, NodeUniop));
} else {
AstVarRef* const vrefp = VN_CAST(nodep->lhsp(), VarRef);
const int widthPow2 = vrefp ? vrefp->varp()->dtypep()->widthPow2()
: nodep->lhsp()->dtypep()->widthPow2();
UASSERT_OBJ(widthPow2 > 1, nodep,
"Reduction over single bit value should have been folded");
putbs("VL_REDXOR_");
puts(cvtToStr(nodep->lhsp()->dtypep()->widthPow2()));
puts(cvtToStr(widthPow2));
puts("(");
iterateAndNextNull(nodep->lhsp());
puts(")");