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Added option to enable generating less precise mad (multiply addition)
for those architectures that support the instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67363 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -26,6 +26,14 @@ namespace llvm {
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/// elimination optimization, this option should disable it.
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extern bool NoFramePointerElim;
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/// LessPreciseFPMAD - This flag is enabled when the
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/// -enable-fp-mad is specified on the command line. When this flag is off
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/// (the default), the code generator is not allowed to generate mad
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/// (multiply add) if the result is "less precise" than doing those operations
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/// individually.
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extern bool LessPreciseFPMADOption;
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extern bool LessPreciseFPMAD();
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/// NoExcessFPPrecision - This flag is enabled when the
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/// -disable-excess-fp-precision flag is specified on the command line. When
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/// this flag is off (the default), the code generator is allowed to produce
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@ -39,7 +47,7 @@ namespace llvm {
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/// this flag is off (the default), the code generator is not allowed to
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/// produce results that are "less precise" than IEEE allows. This includes
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/// use of X86 instructions like FSIN and FCOS instead of libcalls.
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/// UnsafeFPMath implies FiniteOnlyFPMath.
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/// UnsafeFPMath implies FiniteOnlyFPMath and LessPreciseFPMAD.
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extern bool UnsafeFPMath;
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/// FiniteOnlyFPMath - This returns true when the -enable-finite-only-fp-math
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@ -22,6 +22,7 @@ using namespace llvm;
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//
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namespace llvm {
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bool LessPreciseFPMADOption;
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bool PrintMachineCode;
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bool NoFramePointerElim;
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bool NoExcessFPPrecision;
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@ -59,6 +60,11 @@ DisableExcessPrecision("disable-excess-fp-precision",
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cl::location(NoExcessFPPrecision),
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cl::init(false));
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static cl::opt<bool, true>
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EnableFPMAD("enable-fp-mad",
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cl::desc("Enable less precise MAD instructions to be generated"),
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cl::location(LessPreciseFPMADOption),
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cl::init(false));
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static cl::opt<bool, true>
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EnableUnsafeFPMath("enable-unsafe-fp-math",
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cl::desc("Enable optimizations that may decrease FP precision"),
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cl::location(UnsafeFPMath),
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@ -198,6 +204,12 @@ void TargetMachine::setCodeModel(CodeModel::Model Model) {
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}
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namespace llvm {
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/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
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/// is specified on the command line. When this flag is off(default), the
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/// code generator is not allowed to generate mad (multiply add) if the
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/// result is "less precise" than doing those operations individually.
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bool LessPreciseFPMAD() { return UnsafeFPMath || LessPreciseFPMADOption; }
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/// FiniteOnlyFPMath - This returns true when the -enable-finite-only-fp-math
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/// option is specified on the command line. If this returns false (default),
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/// the code generator is not allowed to assume that FP arithmetic arguments
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