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Cache dereferenced values. Cuts loading time from 15 to 5 seconds in debug mode :)

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This commit is contained in:
Ian Curtis 2017-04-03 12:00:25 +00:00
parent 5aafbbf936
commit c617a453fa
1 changed files with 13 additions and 11 deletions
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24
Src/GameLoader.cpp
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@ -663,12 +663,11 @@ bool GameLoader::ComputeRegionSize(uint32_t *region_size, const GameLoader::Regi
// We need to preserve the absolute offsets in order for byte swapping to work // We need to preserve the absolute offsets in order for byte swapping to work
// properly when chunk size is 1 // properly when chunk size is 1
static inline void CopyBytes(uint8_t *dest_base, size_t dest_offset, const uint8_t *src_base, size_t src_offset, size_t size, bool byte_swap) static inline void CopyBytes(uint8_t *dest_base, uint32_t dest_offset, const uint8_t *src_base, uint32_t src_offset, uint32_t size, uint32_t byte_swap)
{ {
size_t swap = byte_swap ? 1 : 0; for (uint32_t i = 0; i < size; i++)
for (size_t i = 0; i < size; i++)
{ {
dest_base[(dest_offset + i) ^ swap] = src_base[src_offset + i]; dest_base[(dest_offset + i) ^ byte_swap] = src_base[src_offset + i];
} }
} }
@ -692,14 +691,17 @@ bool GameLoader::LoadRegion(ROM *rom, const GameLoader::Region::ptr_t &region, c
} }
else else
{ {
size_t num_chunks = file_size / region->chunk_size; uint32_t num_chunks = (uint32_t)file_size / region->chunk_size;
size_t dest_offset = file->offset; uint32_t dest_offset = file->offset;
size_t src_offset = 0; uint32_t src_offset = 0;
for (size_t i = 0; i < num_chunks; i++) uint32_t chunk_size = (uint32_t)region->chunk_size; // cache these as pointer dereferencing cripples performance in a tight loop
uint32_t stride = (uint32_t)region->stride;
uint32_t byte_swap = region->byte_swap;
for (uint32_t i = 0; i < num_chunks; i++)
{ {
CopyBytes(dest, dest_offset, src, src_offset, region->chunk_size, region->byte_swap); CopyBytes(dest, dest_offset, src, src_offset, chunk_size, byte_swap);
dest_offset += region->stride; dest_offset += stride;
src_offset += region->chunk_size; src_offset += chunk_size;
} }
} }
} }