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VarAction2: Remove redundant constant loads

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This commit is contained in:
Jonathan G Rennison
2022-05-25 22:50:10 +01:00
parent 74e1a40f7c
commit e732042785
1 changed files with 18 additions and 1 deletions
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19
src/newgrf.cpp
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@@ -5552,6 +5552,7 @@ enum VarAction2AdjustInferenceFlags {
VA2AIF_PREV_TERNARY = 0x04,
VA2AIF_PREV_MASK_ADJUST = 0x08,
VA2AIF_PREV_STORE_TMP = 0x10,
VA2AIF_HAVE_CONSTANT = 0x20,
VA2AIF_PREV_MASK = VA2AIF_PREV_TERNARY | VA2AIF_PREV_MASK_ADJUST | VA2AIF_PREV_STORE_TMP,
};
@@ -5620,6 +5621,7 @@ static void NewSpriteGroup(ByteReader *buf)
};
VarAction2AdjustInferenceFlags inference = VA2AIF_NONE;
uint32 current_constant = 0;
/* Loop through the var adjusts. Unfortunately we don't know how many we have
* from the outset, so we shall have to keep reallocing. */
@@ -5752,7 +5754,7 @@ static void NewSpriteGroup(ByteReader *buf)
break;
case DSGA_OP_OR:
case DSGA_OP_XOR:
if (adjust.and_mask <= 1) inference = prev_inference & (~VA2AIF_PREV_MASK);
if (adjust.and_mask <= 1) inference = prev_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO);
break;
case DSGA_OP_MUL: {
if ((prev_inference & VA2AIF_ONE_OR_ZERO) && adjust.variable == 0x1A && adjust.shift_num == 0) {
@@ -5844,6 +5846,17 @@ static void NewSpriteGroup(ByteReader *buf)
break;
}
}
if (adjust.variable == 0x1A || adjust.and_mask == 0) {
uint32 val = EvaluateDeterministicSpriteGroupAdjust(group->size, adjust, nullptr, 0, UINT_MAX);
if ((prev_inference & VA2AIF_HAVE_CONSTANT) && current_constant == val) {
/* reloading previous constant, remove */
group->adjusts.pop_back();
inference = prev_inference;
break;
}
inference |= VA2AIF_HAVE_CONSTANT;
current_constant = val;
}
break;
case DSGA_OP_SHR:
if ((prev_inference & VA2AIF_PREV_MASK_ADJUST) && adjust.variable == 0x1A && adjust.shift_num == 0) {
@@ -5875,6 +5888,10 @@ static void NewSpriteGroup(ByteReader *buf)
/* First adjustment */
add_inferences_from_mask(adjust.and_mask);
inference |= VA2AIF_PREV_MASK_ADJUST;
if (adjust.variable == 0x1A || adjust.and_mask == 0) {
inference |= VA2AIF_HAVE_CONSTANT;
current_constant = EvaluateDeterministicSpriteGroupAdjust(group->size, adjust, nullptr, 0, UINT_MAX);
}
}
/* Continue reading var adjusts while bit 5 is set. */