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authorJakob Stoklund Olesen <stoklund@2pi.dk>2012-11-30 21:42:47 +0000
committerJakob Stoklund Olesen <stoklund@2pi.dk>2012-11-30 21:42:47 +0000
commit882092808b7179e49ee5c52c07ce9c97e3128a81 (patch)
tree0e24cd3af27b3a684b31deca92cffd8fdc60ea82 /tools/llc/llc.cpp
parent8244121b9c130ff2529f3e3ebb3ef2fa4646ba34 (diff)
Add a -time-compilations=<N> option to llc.
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
Diffstat (limited to 'tools/llc/llc.cpp')
-rw-r--r--tools/llc/llc.cpp16
1 files changed, 16 insertions, 0 deletions
diff --git a/tools/llc/llc.cpp b/tools/llc/llc.cpp
index 4d4a74c009e..41ec815719e 100644
--- a/tools/llc/llc.cpp
+++ b/tools/llc/llc.cpp
@@ -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;