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libLTO, llvm-lto, gold: Introduce flag for controlling optimization level.

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This change also introduces a link-time optimization level of 1. This
optimization level runs only the globaldce pass as well as cleanup passes for
passes that run at -O0, specifically simplifycfg which cleans up lowerbitsets.

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150316/266951.html

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232769 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2015-03-19 22:01:00 +00:00
parent 0dda07ad4d
commit 416d8ecf80
10 changed files with 151 additions and 53 deletions
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21
tools/llvm-lto/llvm-lto.cpp
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@@ -26,9 +26,13 @@
using namespace llvm;
static cl::opt<bool>
DisableOpt("disable-opt", cl::init(false),
cl::desc("Do not run any optimization passes"));
static cl::opt<char>
OptLevel("O",
cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
"(default = '-O2')"),
cl::Prefix,
cl::ZeroOrMore,
cl::init('2'));
static cl::opt<bool>
DisableInline("disable-inlining", cl::init(false),
@@ -146,6 +150,11 @@ int main(int argc, char **argv) {
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm LTO linker\n");
if (OptLevel < '0' || OptLevel > '3') {
errs() << argv[0] << ": optimization level must be between 0 and 3\n";
return 1;
}
// Initialize the configured targets.
InitializeAllTargets();
InitializeAllTargetMCs();
@@ -231,6 +240,8 @@ int main(int argc, char **argv) {
// Set cpu and attrs strings for the default target/subtarget.
CodeGen.setCpu(MCPU.c_str());
CodeGen.setOptLevel(OptLevel - '0');
std::string attrs;
for (unsigned i = 0; i < MAttrs.size(); ++i) {
if (i > 0)
@@ -245,7 +256,7 @@ int main(int argc, char **argv) {
size_t len = 0;
std::string ErrorInfo;
const void *Code =
CodeGen.compile(&len, DisableOpt, DisableInline, DisableGVNLoadPRE,
CodeGen.compile(&len, DisableInline, DisableGVNLoadPRE,
DisableLTOVectorization, ErrorInfo);
if (!Code) {
errs() << argv[0]
@@ -265,7 +276,7 @@ int main(int argc, char **argv) {
} else {
std::string ErrorInfo;
const char *OutputName = nullptr;
if (!CodeGen.compile_to_file(&OutputName, DisableOpt, DisableInline,
if (!CodeGen.compile_to_file(&OutputName, DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization,
ErrorInfo)) {
errs() << argv[0]