summaryrefslogtreecommitdiff
path: root/src
diff options
context:
space:
mode:
Diffstat (limited to 'src')
-rw-r--r--src/passes/pass.cpp6
-rw-r--r--src/tools/optimization-options.h13
-rw-r--r--src/tools/wasm-reduce.cpp1
3 files changed, 17 insertions, 3 deletions
diff --git a/src/passes/pass.cpp b/src/passes/pass.cpp
index 2f917d779..c0354524d 100644
--- a/src/passes/pass.cpp
+++ b/src/passes/pass.cpp
@@ -132,6 +132,12 @@ void PassRunner::addDefaultOptimizationPasses() {
}
void PassRunner::addDefaultFunctionOptimizationPasses() {
+ // if we are willing to work very very hard, flatten the IR and do opts
+ // that depend on flat IR
+ if (options.optimizeLevel >= 4) {
+ add("flatten");
+ add("local-cse");
+ }
if (!options.debugInfo) { // debug info must be preserved, do not dce it
add("dce");
}
diff --git a/src/tools/optimization-options.h b/src/tools/optimization-options.h
index 9fbba88cb..abe3bcd6d 100644
--- a/src/tools/optimization-options.h
+++ b/src/tools/optimization-options.h
@@ -42,27 +42,34 @@ struct OptimizationOptions : public Options {
passOptions.optimizeLevel = 0;
passOptions.shrinkLevel = 0;
})
- .add("", "-O1", "execute -O1 optimization passes",
+ .add("", "-O1", "execute -O1 optimization passes (quick&useful opts, useful for iteration builds)",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 1;
passOptions.shrinkLevel = 0;
passes.push_back(DEFAULT_OPT_PASSES);
})
- .add("", "-O2", "execute -O2 optimization passes",
+ .add("", "-O2", "execute -O2 optimization passes (most opts, generally gets most perf)",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 2;
passOptions.shrinkLevel = 0;
passes.push_back(DEFAULT_OPT_PASSES);
})
- .add("", "-O3", "execute -O3 optimization passes",
+ .add("", "-O3", "execute -O3 optimization passes (spends potentially a lot of time optimizing)",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
passOptions.optimizeLevel = 3;
passOptions.shrinkLevel = 0;
passes.push_back(DEFAULT_OPT_PASSES);
})
+ .add("", "-O4", "execute -O4 optimization passes (also flatten the IR, which can take a lot more time and memory, but is useful on more nested / complex / less-optimized input)",
+ Options::Arguments::Zero,
+ [this](Options*, const std::string&) {
+ passOptions.optimizeLevel = 4;
+ passOptions.shrinkLevel = 0;
+ passes.push_back(DEFAULT_OPT_PASSES);
+ })
.add("", "-Os", "execute default optimization passes, focusing on code size",
Options::Arguments::Zero,
[this](Options*, const std::string&) {
diff --git a/src/tools/wasm-reduce.cpp b/src/tools/wasm-reduce.cpp
index 6b19e6216..f31c11edd 100644
--- a/src/tools/wasm-reduce.cpp
+++ b/src/tools/wasm-reduce.cpp
@@ -236,6 +236,7 @@ struct Reducer : public WalkerPass<PostWalker<Reducer, UnifiedExpressionVisitor<
"-O1",
"-O2",
"-O3",
+ "-O4",
"--flatten -Os",
"--flatten -O3",
"--flatten --local-cse -Os",