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Teach the 'opt' tool about '-Os' and '-Oz', corresponding to the Clang

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options, to enable easier testing of the innards of LLVM that are
enabled by such optimization strategies.

Note that this doesn't provide the (much needed) function attribute
support for -Oz (as opposed to -Os), but still seems like a positive
step to better test the logic that Clang currently relies on.

Patch by Patrik Hägglund.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156913 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2012-05-16 08:32:49 +00:00
parent 04b2c50427
commit 8bc3434e68
2 changed files with 49 additions and 12 deletions
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8
test/Other/optimize-options.ll Normal file
View File

@ -0,0 +1,8 @@
;RUN: opt -S -O1 -debug-pass=Arguments |& FileCheck %s
;RUN: opt -S -O2 -debug-pass=Arguments |& FileCheck %s
;RUN: opt -S -Os -debug-pass=Arguments |& FileCheck %s
;RUN: opt -S -Oz -debug-pass=Arguments |& FileCheck %s
;RUN: opt -S -O3 -debug-pass=Arguments |& FileCheck %s
; Just check that we get a non-empty set of passes for each -O opton.
;CHECK: Pass Arguments: {{.*}} -print-module

53
tools/opt/opt.cpp
View File

@ -104,15 +104,23 @@ StandardLinkOpts("std-link-opts",
static cl::opt<bool>
OptLevelO1("O1",
cl::desc("Optimization level 1. Similar to llvm-gcc -O1"));
cl::desc("Optimization level 1. Similar to clang -O1"));
static cl::opt<bool>
OptLevelO2("O2",
cl::desc("Optimization level 2. Similar to llvm-gcc -O2"));
cl::desc("Optimization level 2. Similar to clang -O2"));
static cl::opt<bool>
OptLevelOs("Os",
cl::desc("Like -O2 with extra optimizations for size. Similar to clang -Os"));
static cl::opt<bool>
OptLevelOz("Oz",
cl::desc("Like -Os but reduces code size further. Similar to clang -Oz"));
static cl::opt<bool>
OptLevelO3("O3",
cl::desc("Optimization level 3. Similar to llvm-gcc -O3"));
cl::desc("Optimization level 3. Similar to clang -O3"));
static cl::opt<std::string>
TargetTriple("mtriple", cl::desc("Override target triple for module"));
@ -409,16 +417,21 @@ static inline void addPass(PassManagerBase &PM, Pass *P) {
///
/// OptLevel - Optimization Level
static void AddOptimizationPasses(PassManagerBase &MPM,FunctionPassManager &FPM,
unsigned OptLevel) {
unsigned OptLevel, unsigned SizeLevel) {
FPM.add(createVerifierPass()); // Verify that input is correct
PassManagerBuilder Builder;
Builder.OptLevel = OptLevel;
Builder.SizeLevel = SizeLevel;
if (DisableInline) {
// No inlining pass
} else if (OptLevel > 1) {
unsigned Threshold = 225;
if (SizeLevel == 1) // -Os
Threshold = 75;
else if (SizeLevel == 2) // -Oz
Threshold = 25;
if (OptLevel > 2)
Threshold = 275;
Builder.Inliner = createFunctionInliningPass(Threshold);
@ -571,7 +584,7 @@ int main(int argc, char **argv) {
Passes.add(TD);
OwningPtr<FunctionPassManager> FPasses;
if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
FPasses.reset(new FunctionPassManager(M.get()));
if (TD)
FPasses->add(new TargetData(*TD));
@ -617,17 +630,27 @@ int main(int argc, char **argv) {
}
if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
AddOptimizationPasses(Passes, *FPasses, 1);
AddOptimizationPasses(Passes, *FPasses, 1, 0);
OptLevelO1 = false;
}
if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
AddOptimizationPasses(Passes, *FPasses, 2);
AddOptimizationPasses(Passes, *FPasses, 2, 0);
OptLevelO2 = false;
}
if (OptLevelOs && OptLevelOs.getPosition() < PassList.getPosition(i)) {
AddOptimizationPasses(Passes, *FPasses, 2, 1);
OptLevelOs = false;
}
if (OptLevelOz && OptLevelOz.getPosition() < PassList.getPosition(i)) {
AddOptimizationPasses(Passes, *FPasses, 2, 2);
OptLevelOz = false;
}
if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
AddOptimizationPasses(Passes, *FPasses, 3);
AddOptimizationPasses(Passes, *FPasses, 3, 0);
OptLevelO3 = false;
}
@ -682,15 +705,21 @@ int main(int argc, char **argv) {
}
if (OptLevelO1)
AddOptimizationPasses(Passes, *FPasses, 1);
AddOptimizationPasses(Passes, *FPasses, 1, 0);
if (OptLevelO2)
AddOptimizationPasses(Passes, *FPasses, 2);
AddOptimizationPasses(Passes, *FPasses, 2, 0);
if (OptLevelOs)
AddOptimizationPasses(Passes, *FPasses, 2, 1);
if (OptLevelOz)
AddOptimizationPasses(Passes, *FPasses, 2, 2);
if (OptLevelO3)
AddOptimizationPasses(Passes, *FPasses, 3);
AddOptimizationPasses(Passes, *FPasses, 3, 0);
if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
FPasses->doInitialization();
for (Module::iterator F = M->begin(), E = M->end(); F != E; ++F)
FPasses->run(*F);