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Add an -mattr option to the gold plugin to support subtarget features in LTO

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This adds support for an -mattr option to the gold plugin and to llvm-lto. This
allows the caller to specify details of the subtarget architecture, like +aes,
or +ssse3 on x86.  Note that this requires a change to the include/llvm-c/lto.h
interface: it adds a function lto_codegen_set_attr and it increments the
version of the interface.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207279 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Roeder
2014-04-25 21:46:51 +00:00
parent c744a37153
commit 817f5e2fa1
6 changed files with 61 additions and 3 deletions
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22
tools/lto/lto.cpp
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@@ -56,6 +56,20 @@ static void lto_initialize() {
}
}
// Convert the subtarget features into a string to pass to LTOCodeGenerator.
static void lto_add_attrs(lto_code_gen_t cg) {
if (MAttrs.size()) {
std::string attrs;
for (unsigned i = 0; i < MAttrs.size(); ++i) {
if (i > 0)
attrs.append(",");
attrs.append(MAttrs[i]);
}
cg->setAttr(attrs.c_str());
}
}
/// lto_get_version - Returns a printable string.
extern const char* lto_get_version() {
return LTOCodeGenerator::getVersionString();
@@ -252,6 +266,11 @@ void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
return cg->setCpu(cpu);
}
/// lto_codegen_set_attr - Sets the attr to generate code for.
void lto_codegen_set_attr(lto_code_gen_t cg, const char *attr) {
return cg->setAttr(attr);
}
/// lto_codegen_set_assembler_path - Sets the path to the assembler tool.
void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
// In here only for backwards compatibility. We use MC now.
@@ -278,6 +297,7 @@ void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
if (!parsedOptions) {
cg->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
return !cg->writeMergedModules(path, sLastErrorString);
@@ -292,6 +312,7 @@ bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
if (!parsedOptions) {
cg->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
return cg->compile(length, DisableOpt, DisableInline, DisableGVNLoadPRE,
@@ -304,6 +325,7 @@ const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
if (!parsedOptions) {
cg->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
return !cg->compile_to_file(name, DisableOpt, DisableInline, DisableGVNLoadPRE,