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VarAction2: Add flags to skip adjust if value is 0 or LSB set

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This commit is contained in:
Jonathan G Rennison
2022-06-06 23:04:45 +01:00
parent 236cbc4e83
commit e41a5d2f63
3 changed files with 39 additions and 2 deletions
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17
src/newgrf.cpp
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@@ -5852,6 +5852,10 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
}
}
if (adjust.variable != 0x7E && IsEvalAdjustWithZeroLastValueAlwaysZero(adjust.operation)) {
adjust.adjust_flags |= DSGAF_SKIP_ON_ZERO;
}
if ((prev_inference & VA2AIF_PREV_TERNARY) && adjust.variable == 0x1A && IsEvalAdjustUsableForConstantPropagation(adjust.operation)) {
/* Propagate constant operation back into previous ternary */
DeterministicSpriteGroupAdjust &prev = group->adjusts[group->adjusts.size() - 2];
@@ -5862,7 +5866,7 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
} else if ((prev_inference & VA2AIF_HAVE_CONSTANT) && adjust.variable == 0x1A && IsEvalAdjustUsableForConstantPropagation(adjust.operation)) {
/* Reduce constant operation on previous constant */
replace_with_constant_load(EvaluateDeterministicSpriteGroupAdjust(group->size, adjust, nullptr, state.current_constant, UINT_MAX));
} else if ((prev_inference & VA2AIF_HAVE_CONSTANT) && state.current_constant == 0 && adjust.variable != 0x7E && IsEvalAdjustWithZeroLastValueAlwaysZero(adjust.operation)) {
} else if ((prev_inference & VA2AIF_HAVE_CONSTANT) && state.current_constant == 0 && (adjust.adjust_flags & DSGAF_SKIP_ON_ZERO)) {
/* Remove operation which does nothing when applied to 0 */
group->adjusts.pop_back();
state.inference = prev_inference;
@@ -5880,6 +5884,7 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
}
}
current.operation = DSGA_OP_RST;
current.adjust_flags = DSGAF_NONE;
group->adjusts.push_back(current);
OptimiseVarAction2Adjust(state, feature, varsize, group, group->adjusts.back());
return;
@@ -5917,6 +5922,9 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
} else if (adjust.operation == DSGA_OP_OR || adjust.operation == DSGA_OP_XOR || adjust.operation == DSGA_OP_AND) {
state.inference |= (prev_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO));
}
if (adjust.operation == DSGA_OP_OR && (prev_inference & VA2AIF_ONE_OR_ZERO) && adjust.variable != 0x7E) {
adjust.adjust_flags |= DSGAF_SKIP_ON_LSB_SET;
}
}
} else {
if (adjust.and_mask == 0 && IsEvalAdjustWithZeroRemovable(adjust.operation)) {
@@ -5936,6 +5944,7 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
/* Convert: store, load var, commutative op on stored --> (dead) store, commutative op var */
prev.operation = adjust.operation;
group->adjusts.pop_back();
state.inference = non_const_var_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO);
OptimiseVarAction2Adjust(state, feature, varsize, group, group->adjusts.back());
return;
}
@@ -5952,6 +5961,7 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
/* Convert: store, load var, subtract stored --> (dead) store, reverse subtract var */
prev.operation = DSGA_OP_RSUB;
group->adjusts.pop_back();
state.inference = non_const_var_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO);
OptimiseVarAction2Adjust(state, feature, varsize, group, group->adjusts.back());
return;
}
@@ -6068,6 +6078,7 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
}
if (adjust.and_mask <= 1) state.inference = prev_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO);
state.inference |= prev_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO) & non_const_var_inference;
if ((non_const_var_inference & VA2AIF_ONE_OR_ZERO) || (adjust.and_mask <= 1)) adjust.adjust_flags |= DSGAF_SKIP_ON_LSB_SET;
break;
case DSGA_OP_XOR:
if (adjust.variable == 0x1A && adjust.shift_num == 0 && group->adjusts.size() >= 2) {
@@ -6081,6 +6092,7 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
}
if (prev.operation == DSGA_OP_UMIN && prev.type == DSGA_TYPE_NONE && prev.variable == 0x1A && prev.shift_num == 0 && prev.and_mask == 1) {
prev.operation = DSGA_OP_TERNARY;
prev.adjust_flags = DSGAF_NONE;
prev.and_mask = 0;
prev.add_val = 1;
group->adjusts.pop_back();
@@ -6097,6 +6109,7 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
if (prev.operation == DSGA_OP_OR && prev.type == DSGA_TYPE_NONE && prev.variable == 0x1A && prev.shift_num == 0 && prev.and_mask == adjust.and_mask) {
prev.operation = DSGA_OP_AND;
prev.and_mask = ~prev.and_mask;
prev.adjust_flags = DSGAF_NONE;
group->adjusts.pop_back();
break;
}
@@ -6108,6 +6121,7 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
if ((prev_inference & VA2AIF_ONE_OR_ZERO) && adjust.variable == 0x1A && adjust.shift_num == 0 && group->adjusts.size() >= 2) {
/* Found a ternary operator */
adjust.operation = DSGA_OP_TERNARY;
adjust.adjust_flags = DSGAF_NONE;
while (group->adjusts.size() > 1) {
/* Merge with previous if applicable */
const DeterministicSpriteGroupAdjust &prev = group->adjusts[group->adjusts.size() - 2];
@@ -6537,6 +6551,7 @@ static void OptimiseVarAction2DeterministicSpriteGroupSimplifyStores(Determinist
if (ok) {
const DeterministicSpriteGroupAdjust &src = group->adjusts[src_adjust];
adjust.operation = DSGA_OP_STO_NC;
adjust.adjust_flags = DSGAF_NONE;
adjust.add_val = adjust.and_mask;
adjust.variable = src.variable;
adjust.parameter = src.parameter;