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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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50
tools/lto/lto.cpp
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@@ -23,9 +23,13 @@
#include "llvm/Support/TargetSelect.h"
// extra command-line flags needed for LTOCodeGenerator
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),
@@ -85,6 +89,10 @@ static void lto_add_attrs(lto_code_gen_t cg) {
CG->setAttr(attrs.c_str());
}
if (OptLevel < '0' || OptLevel > '3')
report_fatal_error("Optimization level must be between 0 and 3");
CG->setOptLevel(OptLevel - '0');
}
extern const char* lto_get_version() {
@@ -281,54 +289,42 @@ void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
unwrap(cg)->addMustPreserveSymbol(symbol);
}
bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
static void maybeParseOptions() {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
}
bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
maybeParseOptions();
return !unwrap(cg)->writeMergedModules(path, sLastErrorString);
}
const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
return unwrap(cg)->compile(length, DisableOpt, DisableInline,
maybeParseOptions();
return unwrap(cg)->compile(length, DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization,
sLastErrorString);
}
bool lto_codegen_optimize(lto_code_gen_t cg) {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
return !unwrap(cg)->optimize(DisableOpt, DisableInline,
maybeParseOptions();
return !unwrap(cg)->optimize(DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization,
sLastErrorString);
}
const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
maybeParseOptions();
return unwrap(cg)->compileOptimized(length, sLastErrorString);
}
bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
maybeParseOptions();
return !unwrap(cg)->compile_to_file(
name, DisableOpt, DisableInline, DisableGVNLoadPRE,
name, DisableInline, DisableGVNLoadPRE,
DisableLTOVectorization, sLastErrorString);
}