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

1 files changed, 9 insertions, 1 deletions

diff --git a/include/llvm/Target/TargetOptions.h b/include/llvm/Target/TargetOptions.h
index 54468f440d..276ea135c7 100644
--- a/include/llvm/Target/TargetOptions.h
+++ b/include/llvm/Target/TargetOptions.h
@@ -26,6 +26,14 @@ namespace llvm {
   /// elimination optimization, this option should disable it.
   extern bool NoFramePointerElim;
 
+  /// LessPreciseFPMAD - This flag is enabled when the
+  /// -enable-fp-mad is specified on the command line.  When this flag is off
+  /// (the default), the code generator is not allowed to generate mad
+  /// (multiply add) if the result is "less precise" than doing those operations
+  /// individually.
+  extern bool LessPreciseFPMADOption;
+  extern bool LessPreciseFPMAD();
+
   /// NoExcessFPPrecision - This flag is enabled when the
   /// -disable-excess-fp-precision flag is specified on the command line.  When
   /// this flag is off (the default), the code generator is allowed to produce
@@ -39,7 +47,7 @@ namespace llvm {
   /// this flag is off (the default), the code generator is not allowed to
   /// produce results that are "less precise" than IEEE allows.  This includes
   /// use of X86 instructions like FSIN and FCOS instead of libcalls.
-  /// UnsafeFPMath implies FiniteOnlyFPMath.
+  /// UnsafeFPMath implies FiniteOnlyFPMath and LessPreciseFPMAD.
   extern bool UnsafeFPMath;
 
   /// FiniteOnlyFPMath - This returns true when the -enable-finite-only-fp-math