shylie/llvm-project
1
0
Fork 0
Code Issues Pull Requests Actions 6 Packages Projects Releases Wiki Activity

[libLTO] add thinlto caching flags to libLTO (#168567)

Browse Source 
On AIX, the linker's release cadence is once per year and it doesn't
backport non-critical fixes to previous releases.
We would like to get thinLTO caching accessible for current customers,
so this PR adds the cache flags as cl::opt options.
This commit is contained in:
Wael Yehia 2025-11-19 10:19:24 -05:00 committed by GitHub
parent 7a3923676f
commit c2b4e481a0
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 43 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
llvm/tools/lto/lto.cpp
View File

@ -24,6 +24,7 @@
#include "llvm/LTO/legacy/LTOCodeGenerator.h"
#include "llvm/LTO/legacy/LTOModule.h"
#include "llvm/LTO/legacy/ThinLTOCodeGenerator.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetSelect.h"
@ -44,6 +45,29 @@ static cl::opt<bool> EnableFreestanding(
"lto-freestanding", cl::init(false),
cl::desc("Enable Freestanding (disable builtins / TLI) during LTO"));
static cl::opt<std::string> ThinLTOCacheDir(
"legacy-thinlto-cache-dir",
cl::desc("Experimental option, enable ThinLTO caching. Note: the cache "
"currently does not take the mcmodel setting into account, so you "
"might get false hits if different mcmodels are used in different "
"builds using the same cache directory."));
static cl::opt<int> ThinLTOCachePruningInterval(
"legacy-thinlto-cache-pruning-interval", cl::init(1200),
cl::desc("Set ThinLTO cache pruning interval (seconds)."));
static cl::opt<uint64_t> ThinLTOCacheMaxSizeBytes(
"legacy-thinlto-cache-max-size-bytes",
cl::desc("Set ThinLTO cache pruning directory maximum size in bytes."));
static cl::opt<int> ThinLTOCacheMaxSizeFiles(
"legacy-thinlto-cache-max-size-files", cl::init(1000000),
cl::desc("Set ThinLTO cache pruning directory maximum number of files."));
static cl::opt<unsigned> ThinLTOCacheEntryExpiration(
"legacy-thinlto-cache-entry-expiration", cl::init(604800) /* 1w */,
cl::desc("Set ThinLTO cache entry expiration time (seconds)."));
#ifdef NDEBUG
static bool VerifyByDefault = false;
#else
@ -543,6 +567,25 @@ thinlto_code_gen_t thinlto_create_codegen(void) {
assert(CGOptLevelOrNone);
CodeGen->setCodeGenOptLevel(*CGOptLevelOrNone);
}
if (!ThinLTOCacheDir.empty()) {
auto Err = llvm::sys::fs::create_directories(ThinLTOCacheDir);
if (Err)
report_fatal_error(Twine("Unable to create thinLTO cache directory: ") +
Err.message());
bool result;
Err = llvm::sys::fs::is_directory(ThinLTOCacheDir, result);
if (Err || !result)
report_fatal_error(Twine("Unable to get status of thinLTO cache path or "
"path is not a directory: ") +
Err.message());
CodeGen->setCacheDir(ThinLTOCacheDir);
CodeGen->setCachePruningInterval(ThinLTOCachePruningInterval);
CodeGen->setCacheEntryExpiration(ThinLTOCacheEntryExpiration);
CodeGen->setCacheMaxSizeFiles(ThinLTOCacheMaxSizeFiles);
CodeGen->setCacheMaxSizeBytes(ThinLTOCacheMaxSizeBytes);
}
return wrap(CodeGen);
}