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Add VLQ bench, improve decodeVLQ perf

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This commit is contained in:
Jarred Sumner
2022-03-07 21:02:29 -08:00
parent ce081f15e9
commit 0456845256
3 changed files with 138 additions and 3 deletions
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9
src/sourcemap/sourcemap.zig
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@@ -298,7 +298,7 @@ const base64_lut: [std.math.maxInt(u7)]u7 = brk: {
break :brk bytes;
};
fn decodeVLQ(encoded: []const u8, start: usize) VLQResult {
pub fn decodeVLQ(encoded: []const u8, start: usize) VLQResult {
var shift: u8 = 0;
var vlq: u32 = 0;
@@ -306,8 +306,10 @@ fn decodeVLQ(encoded: []const u8, start: usize) VLQResult {
// by doing it this way, we can hint to the compiler that it will not exceed 9
const encoded_ = encoded[start..][0..@minimum(encoded.len - start, comptime (vlq_max_in_bytes + 1))];
for (encoded_) |c, i| {
const index = @as(u32, base64_lut[@truncate(u7, c)]);
comptime var i: usize = 0;
inline while (i < vlq_max_in_bytes + 1) : (i += 1) {
const index = @as(u32, base64_lut[@truncate(u7, encoded_[i])]);
// decode a byte
vlq |= (index & 31) << @truncate(u5, shift);
@@ -563,6 +565,7 @@ pub fn appendMappingToBuffer(buffer_: MutableString, last_byte: u8, prev_state:
if (needs_comma) {
buffer.appendCharAssumeCapacity(',');
}
comptime var i: usize = 0;
inline while (i < vlq.len) : (i += 1) {
buffer.appendAssumeCapacity(vlq[i].bytes[0..vlq[i].len]);