Add an intrinsic and codegen support for fused multiply-accumulate. The intent

is to use this for architectures that have a native FMA instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134742 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 11 insertions, 1 deletions

diff --git a/include/llvm/CodeGen/ISDOpcodes.h b/include/llvm/CodeGen/ISDOpcodes.h
index 498614e7fd..459cecda21 100644
--- a/include/llvm/CodeGen/ISDOpcodes.h
+++ b/include/llvm/CodeGen/ISDOpcodes.h
@@ -232,7 +232,7 @@ namespace ISD {
     SMULO, UMULO,
 
     // Simple binary floating point operators.
-    FADD, FSUB, FMUL, FDIV, FREM,
+    FADD, FSUB, FMUL, FMA, FDIV, FREM,
 
     // FCOPYSIGN(X, Y) - Return the value of X with the sign of Y.  NOTE: This
     // DAG node does not require that X and Y have the same type, just that they
diff --git a/include/llvm/CodeGen/RuntimeLibcalls.h b/include/llvm/CodeGen/RuntimeLibcalls.h
index 44d9477978..4bfd4ab530 100644
--- a/include/llvm/CodeGen/RuntimeLibcalls.h
+++ b/include/llvm/CodeGen/RuntimeLibcalls.h
@@ -103,6 +103,10 @@ namespace RTLIB {
     REM_F64,
     REM_F80,
     REM_PPCF128,
+    FMA_F32,
+    FMA_F64,
+    FMA_F80,
+    FMA_PPCF128,
     POWI_F32,
     POWI_F64,
     POWI_F80,
diff --git a/include/llvm/Intrinsics.td b/include/llvm/Intrinsics.td
index c854471036..947cf1be7d 100644
--- a/include/llvm/Intrinsics.td
+++ b/include/llvm/Intrinsics.td
@@ -255,6 +255,12 @@ let Properties = [IntrReadMem] in {
   def int_exp2 : Intrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>]>;
 }
 
+let Properties = [IntrNoMem] in {
+  def int_fma  : Intrinsic<[llvm_anyfloat_ty],
+                         [LLVMMatchType<0>, LLVMMatchType<0>,
+                          LLVMMatchType<0>]>;
+}
+
 // NOTE: these are internal interfaces.
 def int_setjmp     : Intrinsic<[llvm_i32_ty],  [llvm_ptr_ty]>;
 def int_longjmp    : Intrinsic<[], [llvm_ptr_ty, llvm_i32_ty]>;