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Micro-optimize LineOffsetTable.generate

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5.00 ms  100.0%	0 s	 	bun (81023)
2.00 ms   40.0%	2.00 ms	 	 WTF::HashTableAddResult<WTF::HashTableIterator<WTF::HashTable<WTF::Packed<WTF::StringImpl*>, WTF::Packed<WTF::StringImpl*>, WTF::IdentityExtractor, WTF::DefaultHash<WTF::Packed<WTF::StringImpl*>>, WTF::HashTraits<WTF::Packed<WTF::StringImpl*>>, WTF::HashTraits<WTF::Packed<WTF::StringImpl*>>>, WTF::Packed<WTF::StringImpl*>, WTF::Packed<WTF::StringImpl*>, WTF::IdentityExtractor, WTF::DefaultHash<WTF::Packed<WTF::StringImpl*>>, WTF::HashTraits<WTF::Packed<WTF::StringImpl*>>, WTF::HashTraits<WTF::Packed<WTF::StringImpl*>>>> WTF::HashTable<WTF::Packed<WTF::StringImpl*>, WTF::Packed<WTF::StringImpl*>, WTF::IdentityExtractor, WTF::DefaultHash<WTF::Packed<WTF::StringImpl*>>, WTF::HashTraits<WTF::Packed<WTF::StringImpl*>>, WTF::HashTraits<WTF::Packed<WTF::StringImpl*>>>::addPassingHashCode<WTF::HashSetTranslatorAdapter<WTF::BufferFromStaticDataTranslator<unsigned char>>, WTF::HashTranslatorCharBuffer<unsigned char> const&, WTF::HashTranslatorCharBuffer<unsigned char> const&>(WTF::HashTranslatorCharBuffer<unsigned char> const&, WTF::HashTranslatorCharBuffer<unsigned char> const&)
2.00 ms   40.0%	2.00 ms	 	 heap.StackFallbackAllocator(1024).free
2.00 ms   40.0%	0 s	 	  em.Allocator.rawFree
2.00 ms   40.0%	0 s	 	   em.Allocator.log2a
2.00 ms   40.0%	0 s	 	    em.Allocator.free__anon_1330765
2.00 ms   40.0%	0 s	 	     em.Allocator.resize__anon_1069235
2.00 ms   40.0%	0 s	 	      array_list.ArrayListAligned(i32,null).toOwnedSlice
This commit is contained in:
Jarred Sumner
2023-07-30 08:27:31 -07:00
parent e636f1b026
commit 092ada6d2f
1 changed files with 4 additions and 1 deletions
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5
src/sourcemap/sourcemap.zig
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@@ -933,7 +933,10 @@ pub const LineOffsetTable = struct {
continue;
}
var owned = columns_for_non_ascii.toOwnedSlice() catch unreachable;
// We don't call .toOwnedSlice() because it is expensive to
// reallocate the array AND when inside an Arena, it's
// hideously expensive
var owned = columns_for_non_ascii.items;
if (stack_fallback.fixed_buffer_allocator.ownsSlice(std.mem.sliceAsBytes(owned))) {
owned = allocator.dupe(i32, owned) catch unreachable;
}