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removal of unused functionality and some follow-on simplifications

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This commit is contained in:
Vern Paxson 2023-06-16 16:16:13 -07:00 • committed by Arne Welzel
parent ecc93606c4
commit b6b4a81e0d
9 changed files with 17 additions and 143 deletions
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41
src/script_opt/ZAM/AM-Opt.cc
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@ -927,47 +927,6 @@ const ZInstI* ZAMCompiler::EndOfLoop(const ZInstI* inst, int depth) const
return insts1[i];
}
bool ZAMCompiler::VarIsAssigned(int slot) const
{
for ( auto& inst : insts1 )
if ( inst->live && VarIsAssigned(slot, inst) )
return true;
return false;
}
bool ZAMCompiler::VarIsAssigned(int slot, const ZInstI* i) const
{
// Special-case for table iterators, which assign to a bunch
// of variables but they're not immediately visible in the
// instruction layout.
if ( i->op == OP_NEXT_TABLE_ITER_VAL_VAR_VVV || i->op == OP_NEXT_TABLE_ITER_VV )
{
auto& iter_vars = i->aux->loop_vars;
for ( auto v : iter_vars )
if ( v == slot )
return true;
if ( i->op != OP_NEXT_TABLE_ITER_VAL_VAR_VVV )
return false;
// Otherwise fall through, since that flavor of iterate
// *does* also assign to slot 1.
}
if ( i->op == OP_NEXT_VECTOR_ITER_VAL_VAR_VVVV && i->v2 == slot )
return true;
if ( i->op_type == OP_VV_FRAME )
// We don't want to consider these as assigning to the
// variable, since the point of this method is to figure
// out which variables don't need storing to the frame
// because their internal value is never modified.
return false;
return i->AssignsToSlot1() && i->v1 == slot;
}
bool ZAMCompiler::VarIsUsed(int slot) const
{
for ( auto& inst : insts1 )