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StyleManager: simplify rule evaluation by removing SIMD complexity

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Adrià Arrufat
2026-03-20 12:38:15 +09:00
parent 1353f76bf1
commit 35cdc3c348
1 changed files with 11 additions and 108 deletions
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119
src/browser/StyleManager.zig
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@@ -304,76 +304,25 @@ fn isElementHidden(self: *StyleManager, el: *Element, options: CheckVisibilityOp
return;
}
const len = rules.len;
const priorities = rules.items(.priority);
const props_list = rules.items(.props);
const selectors = rules.items(.selector);
const vec_len = std.simd.suggestVectorLength(u64) orelse 4;
var i: usize = 0;
while (i + vec_len <= len) {
const p_chunk: @Vector(vec_len, u64) = priorities[i..][0..vec_len].*;
const min_priority = @min(@min(ctx.display_priority.*, ctx.visibility_priority.*), ctx.opacity_priority.*);
const min_p_vec: @Vector(vec_len, u64) = @splat(min_priority);
const cmp = p_chunk > min_p_vec;
const any_can_beat = @reduce(.Or, cmp);
if (!any_can_beat) {
i += vec_len;
continue;
}
for (0..vec_len) |j| {
const idx = i + j;
const p = priorities[idx];
if (p <= ctx.display_priority.* and p <= ctx.visibility_priority.* and p <= ctx.opacity_priority.*) {
continue;
}
const props = rules.items(.props)[idx];
const dominated = (props.display_none == null or p <= ctx.display_priority.*) and
(props.visibility_hidden == null or p <= ctx.visibility_priority.*) and
(props.opacity_zero == null or p <= ctx.opacity_priority.*);
if (dominated) continue;
const selector = rules.items(.selector)[idx];
if (matchesSelector(ctx.el, selector, ctx.page)) {
if (props.display_none != null and p > ctx.display_priority.*) {
ctx.display_none.* = props.display_none;
ctx.display_priority.* = p;
}
if (props.visibility_hidden != null and p > ctx.visibility_priority.*) {
ctx.visibility_hidden.* = props.visibility_hidden;
ctx.visibility_priority.* = p;
}
if (props.opacity_zero != null and p > ctx.opacity_priority.*) {
ctx.opacity_zero.* = props.opacity_zero;
ctx.opacity_priority.* = p;
}
}
}
i += vec_len;
}
// Remainder
while (i < len) : (i += 1) {
const p = priorities[i];
for (priorities, props_list, selectors) |p, props, selector| {
// Fast skip using packed u64 priority
if (p <= ctx.display_priority.* and p <= ctx.visibility_priority.* and p <= ctx.opacity_priority.*) {
continue;
}
const props = rules.items(.props)[i];
// Logic for property dominance
const dominated = (props.display_none == null or p <= ctx.display_priority.*) and
(props.visibility_hidden == null or p <= ctx.visibility_priority.*) and
(props.opacity_zero == null or p <= ctx.opacity_priority.*);
if (dominated) continue;
const selector = rules.items(.selector)[i];
if (matchesSelector(ctx.el, selector, ctx.page)) {
// Update best priorities
if (props.display_none != null and p > ctx.display_priority.*) {
ctx.display_none.* = props.display_none;
ctx.display_priority.* = p;
@@ -479,60 +428,14 @@ fn elementHasPointerEventsNone(self: *StyleManager, el: *Element) bool {
fn check(rules: *const RuleList, res: *?bool, current_priority: *u64, elem: *Element, p: *Page) void {
if (current_priority.* == INLINE_PRIORITY) return;
const len = rules.len;
const priorities = rules.items(.priority);
const props_list = rules.items(.props);
const selectors = rules.items(.selector);
const vec_len = std.simd.suggestVectorLength(u64) orelse 4;
var i: usize = 0;
for (priorities, props_list, selectors) |priority, props, selector| {
if (priority <= current_priority.*) continue;
if (props.pointer_events_none == null) continue;
while (i + vec_len <= len) {
const p_chunk: @Vector(vec_len, u64) = priorities[i..][0..vec_len].*;
const min_p_vec: @Vector(vec_len, u64) = @splat(current_priority.*);
const cmp = p_chunk > min_p_vec;
const any_can_beat = @reduce(.Or, cmp);
if (!any_can_beat) {
i += vec_len;
continue;
}
for (0..vec_len) |j| {
const idx = i + j;
const priority = priorities[idx];
if (priority <= current_priority.*) {
continue;
}
const props = rules.items(.props)[idx];
if (props.pointer_events_none == null) {
continue;
}
const selector = rules.items(.selector)[idx];
if (matchesSelector(elem, selector, p)) {
res.* = props.pointer_events_none;
current_priority.* = priority;
}
}
i += vec_len;
}
// Remainder
while (i < len) : (i += 1) {
const priority = priorities[i];
if (priority <= current_priority.*) {
continue;
}
const props = rules.items(.props)[i];
if (props.pointer_events_none == null) {
continue;
}
const selector = rules.items(.selector)[i];
if (matchesSelector(elem, selector, p)) {
res.* = props.pointer_events_none;
current_priority.* = priority;