AMDGPU/EG: Add a new FeatureFMA and use it to selectively enable FMA instruction

Only used by pre-GCN targets
v2: fix predicate setting for FMA_Common

Differential Revision: https://reviews.llvm.org/D40692

llvm-svn: 319712

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp b/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp
index 0d62c5a32d4..66291d0be4e 100644
--- a/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp
@@ -211,6 +211,11 @@ R600TargetLowering::R600TargetLowering(const TargetMachine &TM,
   setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
   setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
 
+  if (!Subtarget->hasFMA()) {
+    setOperationAction(ISD::FMA, MVT::f32, Expand);
+    setOperationAction(ISD::FMA, MVT::f64, Expand);
+  }
+
   setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
 
   const MVT ScalarIntVTs[] = { MVT::i32, MVT::i64 };