[X86] Disable custom widening of signed/unsigned add/sub saturation intrinsics under -x86-experimental-vector-widening-legalization.

Generic legalization should take care of this.

llvm-svn: 349714

1 files changed, 10 insertions, 7 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index e381d0cace0..10d96131c81 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -837,13 +837,16 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
     setOperationAction(ISD::SADDSAT,            MVT::v8i16, Legal);
     setOperationAction(ISD::USUBSAT,            MVT::v8i16, Legal);
     setOperationAction(ISD::SSUBSAT,            MVT::v8i16, Legal);
-    // Use widening instead of promotion.
-    for (auto VT : { MVT::v8i8, MVT::v4i8, MVT::v2i8,
-                     MVT::v4i16, MVT::v2i16 }) {
-      setOperationAction(ISD::UADDSAT, VT, Custom);
-      setOperationAction(ISD::SADDSAT, VT, Custom);
-      setOperationAction(ISD::USUBSAT, VT, Custom);
-      setOperationAction(ISD::SSUBSAT, VT, Custom);
+
+    if (!ExperimentalVectorWideningLegalization) {
+      // Use widening instead of promotion.
+      for (auto VT : { MVT::v8i8, MVT::v4i8, MVT::v2i8,
+                       MVT::v4i16, MVT::v2i16 }) {
+        setOperationAction(ISD::UADDSAT, VT, Custom);
+        setOperationAction(ISD::SADDSAT, VT, Custom);
+        setOperationAction(ISD::USUBSAT, VT, Custom);
+        setOperationAction(ISD::SSUBSAT, VT, Custom);
+      }
     }
 
     setOperationAction(ISD::INSERT_VECTOR_ELT,  MVT::v8i16, Custom);