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Optimize away STACK 0 bytecodes 

They got created for this without parentheses.
rope
Günther Brammer 2011-05-07 00:18:00 +02:00
parent 0c2ea0b6b5
commit 283876696d
1 changed files with 11 additions and 2 deletions
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13
src/script/C4AulParse.cpp
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@ -960,13 +960,22 @@ int C4AulParseState::AddBCC(C4AulBCCType eType, intptr_t X)
// Join checks only if it's not a jump target
if (!fJump && a->GetLastCode())
{
// Join together stack operations
C4AulBCC *pCPos1 = a->GetLastCode();
// Skip noop stack operation
if(eType == AB_STACK && X == 0)
{
return a->GetCodePos() - 1;
}
// Join together stack operations
if(eType == AB_STACK && pCPos1->bccType == AB_STACK &&
(X <= 0 || pCPos1->Par.i >= 0))
{
pCPos1->Par.i += X;
// Empty? Remove it.
// Empty? Remove it. This relies on the parser not issuing
// multiple negative stack operations consecutively, as
// that could result in removing a jump target bytecode.
if (!pCPos1->Par.i)
a->RemoveLastBCC();
return a->GetCodePos() - 1;