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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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7
include/llvm/LTO/LTOCodeGenerator.h
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@ -76,6 +76,7 @@ struct LTOCodeGenerator {
void setCpu(const char *mCpu) { MCpu = mCpu; }
void setAttr(const char *mAttr) { MAttr = mAttr; }
void setOptLevel(unsigned optLevel) { OptLevel = optLevel; }
void addMustPreserveSymbol(const char *sym) { MustPreserveSymbols[sym] = 1; }
@ -102,7 +103,6 @@ struct LTOCodeGenerator {
// Do not try to remove the object file in LTOCodeGenerator's destructor
// as we don't who (LTOCodeGenerator or the obj file) will last longer.
bool compile_to_file(const char **name,
bool disableOpt,
bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
@ -114,15 +114,13 @@ struct LTOCodeGenerator {
// caller. This function should delete intermediate object file once its content
// is brought to memory. Return NULL if the compilation was not successful.
const void *compile(size_t *length,
bool disableOpt,
bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
std::string &errMsg);
// Optimizes the merged module. Returns true on success.
bool optimize(bool disableOpt,
bool disableInline,
bool optimize(bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
std::string &errMsg);
@ -171,6 +169,7 @@ private:
std::string MAttr;
std::string NativeObjectPath;
TargetOptions Options;
unsigned OptLevel;
lto_diagnostic_handler_t DiagHandler;
void *DiagContext;
LTOModule *OwnedModule;