void do_optimize(const Index& index, FuncAnalysis ainfo) {
FTRACE(2, "{:-^70}\n", "Optimize Func");
visit_blocks("first pass", index, ainfo, first_pass);
/*
* Note, it's useful to do dead block removal before DCE, so it can
* remove code relating to the branch to the dead block.
*/
remove_unreachable_blocks(index, ainfo);
if (options.LocalDCE) {
visit_blocks("local DCE", index, ainfo, local_dce);
}
if (options.GlobalDCE) {
global_dce(index, ainfo);
assert(check(*ainfo.ctx.func));
/*
* Global DCE can change types of locals across blocks. See
* dce.cpp for an explanation.
*
* We need to perform a final type analysis before we do anything
* else.
*/
ainfo = analyze_func(index, ainfo.ctx);
}
if (options.InsertAssertions) {
visit_blocks("insert assertions", index, ainfo, insert_assertions);
}
}
void do_optimize(const Index& index, const FuncAnalysis& ainfo) {
FTRACE(2, "{:-^70}\n", "Optimize Func");
visit_blocks("first pass", index, ainfo, first_pass);
/*
* Note, it's useful to do dead block removal before DCE, so it can
* remove code relating to the branch to the dead block.
*
* If we didn't remove jumps to dead blocks, we replace all
* supposedly unreachable blocks with fatal instructions.
*
* TODO(#3751005): removedeadblocks doesn't remove the contents of
* the blocks which it should.
*/
if (!options.RemoveDeadBlocks) {
for (auto& blk : ainfo.rpoBlocks) {
auto const& state = ainfo.bdata[blk->id].stateIn;
if (state.initialized) continue;
auto const srcLoc = blk->hhbcs.front().srcLoc;
blk->hhbcs = {
bc_with_loc(srcLoc, bc::String { s_unreachable.get() }),
bc_with_loc(srcLoc, bc::Fatal { FatalOp::Runtime })
};
blk->fallthrough = nullptr;
}
}
if (options.LocalDCE) {
visit_blocks("local DCE", index, ainfo, local_dce);
}
if (options.GlobalDCE) {
global_dce(index, ainfo);
assert(check(*ainfo.ctx.func));
}
if (options.InsertAssertions) {
/*
* Global DCE can change types of locals across blocks. See
* dce.cpp for an explanation.
*
* We need to perform a final type analysis before we insert type
* assertions.
*/
auto const ainfo2 = analyze_func(index, ainfo.ctx);
visit_blocks("insert assertions", index, ainfo2, insert_assertions);
}
}
