Emmmer added a comment.
I suspect the cause is that g++ tries to instantiate these generic lambdas
inside `std::visit`, which consumes N^2 the size memory (or whatever is
related?) when there's nested-`std::visit`
bool compareInst(const RISCVInst &lhs, const RISCVInst &rhs) {
if (lhs.index() != rhs.index())
return false;
return std::visit(
[&](auto &&L) {
return std::visit(
[&](auto &&R) {
return std::memcmp(&L, &R, sizeof(L)) == 0;
},
rhs);
},
lhs);
}
we can try to change this code to :
bool compareInst(const RISCVInst &L, const RISCVInst &R) {
return std::visit(
[](auto &&lhs, auto &&rhs) {
return std::is_same_v<decltype(lhs), decltype(rhs)> &&
memcmp(&lhs, &rhs, sizeof(lhs)) == 0;
},
L, R);
}
But I’m unsure if it will work.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D136362/new/
https://reviews.llvm.org/D136362
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