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VarAction2: Detect and replace reverse subtract via temp storage

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This commit is contained in:
Jonathan G Rennison
2022-05-27 03:14:07 +01:00
parent 381aa04660
commit 145536e1fd
3 changed files with 18 additions and 0 deletions
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2
src/newgrf_spritegroup.cpp
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@@ -189,6 +189,7 @@ static U EvalAdjustT(const DeterministicSpriteGroupAdjust &adjust, ScopeResolver
case DSGA_OP_SGE: return ((S)last_value >= (S)value) ? 1 : 0;
case DSGA_OP_SLE: return ((S)last_value <= (S)value) ? 1 : 0;
case DSGA_OP_SGT: return ((S)last_value > (S)value) ? 1 : 0;
case DSGA_OP_RSUB: return value - last_value;
default: return value;
}
}
@@ -556,6 +557,7 @@ static const char *_dsg_op_special_names[] {
"SGE",
"SLE",
"SGT",
"RSUB",
};
static_assert(lengthof(_dsg_op_special_names) == DSGA_OP_SPECIAL_END - DSGA_OP_TERNARY);