Mercurial > projects > ldc
diff gen/optimizer.cpp @ 1275:bedf0bfb8fdb
Implement first D-specific optimization pass: -simplify-drtcalls.
It uses the machinery of the standard -simplify-libcalls pass, but optimizes
calls to the D runtime instead of calls to C libraries.
At the moment, these optimizations are implemented by this pass:
- Avoid the runtime call for `arr.length = newlen` if it can determine that
the new length isn't longer than the old one.
- Ditto for `cast(T[]) arr` if it will clearly always succeed.
(e.g. if the length of the original array is zero, or if the old element
size is a multiple of the new element size)
| author | Frits van Bommel <fvbommel wxs.nl> |
|---|---|
| date | Tue, 28 Apr 2009 21:58:06 +0200 |
| parents | 4ae3b3ceea11 |
| children | 29d3861aa2da |
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--- a/gen/optimizer.cpp Mon Apr 27 22:34:36 2009 +0200 +++ b/gen/optimizer.cpp Tue Apr 28 21:58:06 2009 +0200 @@ -1,6 +1,8 @@ #include "gen/optimizer.h" #include "gen/cl_helpers.h" +#include "gen/passes/Passes.h" + #include "llvm/PassManager.h" #include "llvm/LinkAllPasses.h" #include "llvm/Analysis/LoopPass.h" @@ -33,9 +35,19 @@ clEnumValEnd), cl::init(0)); +static cl::opt<bool> +disableLangSpecificPasses("disable-d-passes", + cl::desc("Disable D-specific passes in -O<N>"), + cl::ZeroOrMore); + +static cl::opt<bool> +disableSimplifyRuntimeCalls("disable-simplify-drtcalls", + cl::desc("Disable simplification of runtime calls in -O<N>"), + cl::ZeroOrMore); + static cl::opt<opts::BoolOrDefaultAdapter, false, opts::FlagParser> enableInlining("inlining", - cl::desc("(*) Enable function inlining (in -O<N>, if given)"), + cl::desc("(*) Enable function inlining in -O<N>"), cl::ZeroOrMore); // Determine whether or not to run the inliner as part of the default list of @@ -103,6 +115,11 @@ } } + if (optimizeLevel >= 2 && !disableLangSpecificPasses + && !disableSimplifyRuntimeCalls) { + pm.add(createSimplifyDRuntimeCalls()); + } + // -O3 if (optimizeLevel >= 3) {