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VarAction2: Detect and replace ternary operator pattern

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This commit is contained in:
Jonathan G Rennison
2022-05-25 01:50:10 +01:00
parent e3df522111
commit 7283825638
3 changed files with 147 additions and 6 deletions
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35
src/newgrf_spritegroup.h
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@@ -161,6 +161,10 @@ enum DeterministicSpriteGroupAdjustOperation {
DSGA_OP_SAR, ///< (signed) a >> b
DSGA_OP_END,
DSGA_OP_TERNARY = 0x80, ///< a == 0 ? b : c,
DSGA_OP_SPECIAL_END,
};
inline bool IsEvalAdjustWithZeroRemovable(DeterministicSpriteGroupAdjustOperation op)
@@ -181,6 +185,36 @@ inline bool IsEvalAdjustWithZeroRemovable(DeterministicSpriteGroupAdjustOperatio
}
}
inline bool IsEvalAdjustUsableForConstantPropagation(DeterministicSpriteGroupAdjustOperation op)
{
switch (op) {
case DSGA_OP_ADD:
case DSGA_OP_SUB:
case DSGA_OP_SMIN:
case DSGA_OP_SMAX:
case DSGA_OP_UMIN:
case DSGA_OP_UMAX:
case DSGA_OP_SDIV:
case DSGA_OP_SMOD:
case DSGA_OP_UDIV:
case DSGA_OP_UMOD:
case DSGA_OP_MUL:
case DSGA_OP_AND:
case DSGA_OP_OR:
case DSGA_OP_XOR:
case DSGA_OP_ROR:
case DSGA_OP_SCMP:
case DSGA_OP_UCMP:
case DSGA_OP_SHL:
case DSGA_OP_SHR:
case DSGA_OP_SAR:
return true;
default:
return false;
}
}
struct DeterministicSpriteGroupAdjust {
DeterministicSpriteGroupAdjustOperation operation;
@@ -457,5 +491,6 @@ struct ResolverObject {
};
void DumpSpriteGroup(const SpriteGroup *sg, std::function<void(const char *)> print);
uint32 EvaluateDeterministicSpriteGroupAdjust(DeterministicSpriteGroupSize size, const DeterministicSpriteGroupAdjust &adjust, ScopeResolver *scope, uint32 last_value, uint32 value);
#endif /* NEWGRF_SPRITEGROUP_H */