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Add a -time-compilations=<N> option to llc.

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This causes llc to repeat the module compilation N times, making it
possible to get more accurate information from -time-passes when
compiling small modules.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169040 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-11-30 21:42:47 +00:00
parent 8244121b9c
commit 882092808b
1 changed files with 16 additions and 0 deletions
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16
tools/llc/llc.cpp
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@ -51,6 +51,11 @@ InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
static cl::opt<unsigned>
TimeCompilations("time-compilations", cl::Hidden, cl::init(1u),
cl::value_desc("N"),
cl::desc("Repeat compilation N times for timing"));
// Determine optimization level.
static cl::opt<char>
OptLevel("O",
@ -71,6 +76,8 @@ DisableSimplifyLibCalls("disable-simplify-libcalls",
cl::desc("Disable simplify-libcalls"),
cl::init(false));
static int compileModule(char**, LLVMContext&);
// GetFileNameRoot - Helper function to get the basename of a filename.
static inline std::string
GetFileNameRoot(const std::string &InputFilename) {
@ -181,6 +188,15 @@ int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
// Compile the module TimeCompilations times to give better compile time
// metrics.
for (unsigned I = TimeCompilations; I; --I)
if (int RetVal = compileModule(argv, Context))
return RetVal;
return 0;
}
static int compileModule(char **argv, LLVMContext &Context) {
// Load the module to be compiled...
SMDiagnostic Err;
std::auto_ptr<Module> M;