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CodeCache: Slightly optimize cache file writing

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ftruncate only requires one call (and one extra seek) instead up to 64 manual
zero writes.
This commit is contained in:
Tony Wasserka committed 2026-05-06 17:08:15 +02:00
1 parent 8f0572283a
commit 60bc5944db
1 file changed
+4 -6
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FEXCore/Source/Interface/Core/CodeCache.cpp
+4 -6
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@@ -300,12 +300,10 @@ bool CodeCache::SaveData(Core::InternalThreadState& Thread, int fd, const Execut
::write(fd, Relocations.data(), Relocations.size() * sizeof(Relocations[0]));
// Pad to next page in file so that the CodeBuffer can be mmap'ed into process on load
char Zero[64] {};
auto Off = lseek(fd, 0, SEEK_CUR);
while (Off != AlignUp(Off, Utils::FEX_PAGE_SIZE)) {
auto BytesToWrite = std::min(AlignUp(Off, Utils::FEX_PAGE_SIZE) - Off, sizeof(Zero));
::write(fd, Zero, BytesToWrite);
Off += BytesToWrite;
{
auto AlignedSize = AlignUp(lseek(fd, 0, SEEK_CUR), Utils::FEX_PAGE_SIZE);
::ftruncate(fd, AlignedSize);
lseek(fd, AlignedSize, SEEK_SET);
}
// Dump the host code (relocated for position-independent serialization)