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Add an option to enable the SSA based peephole optimizer.
Eventually this pass will provide substantially better code in the interim between when we have a crappy isel and nice isel. Unfortunately doing so requires fixing the backend to actually SUPPORT all of the fancy addressing modes that we now generate, and writing a DCE pass for machine code. Each of these is a fairly substantial job, so this will remain disabled for the immediate future. :( git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10276 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -34,6 +34,11 @@ FunctionPass *createX86SimpleInstructionSelector(TargetMachine &TM);
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///
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FunctionPass *createX86PatternInstructionSelector(TargetMachine &TM);
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/// createX86SSAPeepholeOptimizerPass - Create a pass to perform SSA-based X86
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/// specific peephole optimizations.
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///
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FunctionPass *createX86SSAPeepholeOptimizerPass();
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/// createX86PeepholeOptimizer - Create a pass to perform X86 specific peephole
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/// optimizations.
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///
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@ -29,6 +29,8 @@ namespace {
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cl::desc("Print generated machine code"));
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cl::opt<bool> NoPatternISel("disable-pattern-isel", cl::init(true),
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cl::desc("Use the 'simple' X86 instruction selector"));
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cl::opt<bool> NoSSAPeephole("disable-ssa-peephole", cl::init(true),
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cl::desc("Disable the ssa-based peephole optimizer (defaults to disabled)"));
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}
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// allocateX86TargetMachine - Allocate and return a subclass of TargetMachine
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@ -66,9 +68,9 @@ bool X86TargetMachine::addPassesToEmitAssembly(PassManager &PM,
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else
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PM.add(createX86PatternInstructionSelector(*this));
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// TODO: optional optimizations go here
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// FIXME: Add SSA based peephole optimizer here.
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// Run optional SSA-based machine code optimizations next...
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if (!NoSSAPeephole)
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PM.add(createX86SSAPeepholeOptimizerPass());
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// Print the instruction selected machine code...
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if (PrintCode)
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@ -117,7 +119,9 @@ bool X86TargetMachine::addPassesToJITCompile(FunctionPassManager &PM) {
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else
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PM.add(createX86PatternInstructionSelector(*this));
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// TODO: optional optimizations go here
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// Run optional SSA-based machine code optimizations next...
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if (!NoSSAPeephole)
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PM.add(createX86SSAPeepholeOptimizerPass());
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// FIXME: Add SSA based peephole optimizer here.
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