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ZAM fixes for "for" loops that are only used to choose an element from a table/set

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This commit is contained in:
Vern Paxson 2024-01-10 18:42:36 -08:00 • committed by Arne Welzel
parent d1dffd3e1b
commit 6660738b7d
3 changed files with 30 additions and 9 deletions
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18
src/script_opt/ZAM/AM-Opt.cc
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@ -158,15 +158,15 @@ bool ZAMCompiler::RemoveDeadCode() {
}
if ( t && t->inst_num > i0->inst_num && (! i1 || t->inst_num <= i1->inst_num) ) {
// This is effectively a branch to the next
// instruction. Even if i0 is conditional, there's
// no point executing it because regardless of the
// outcome of the conditional, we go to the next
// successive live instruction (and we don't have
// conditionals with side effects).
KillInst(i0);
did_removal = true;
continue;
// This is effectively a branch to the next instruction.
// We can remove it *unless* the instruction has side effects.
// Conditionals don't, but loop-iteration-advancement
// instructions do.
if ( ! i0->IsLoopIterationAdvancement() ) {
KillInst(i0);
did_removal = true;
continue;
}
}
if ( i0->DoesNotContinue() && i1 && i1->num_labels == 0 ) {