[llvm-commits] [llvm] r156156 - in /llvm/trunk: lib/Target/X86/X86ISelLowering.cpp test/CodeGen/X86/avx-shuffle.ll

[Craig Topper]

Author: ctopper
Date: Thu May  3 23:44:49 2012
New Revision: 156156

URL: http://llvm.org/viewvc/llvm-project?rev=156156&view=rev
Log:
Allow v16i16 and v32i8 shuffles to be rewritten as narrower shuffles.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
    llvm/trunk/test/CodeGen/X86/avx-shuffle.ll

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=156156&r1=156155&r2=156156&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Thu May  3 23:44:49 2012
@@ -5920,10 +5920,12 @@
   unsigned Scale;
   switch (VT.SimpleTy) {
   default: llvm_unreachable("Unexpected!");
-  case MVT::v4f32: NewVT = MVT::v2f64; Scale = 2; break;
-  case MVT::v4i32: NewVT = MVT::v2i64; Scale = 2; break;
-  case MVT::v8i16: NewVT = MVT::v4i32; Scale = 2; break;
-  case MVT::v16i8: NewVT = MVT::v4i32; Scale = 4; break;
+  case MVT::v4f32:  NewVT = MVT::v2f64; Scale = 2; break;
+  case MVT::v4i32:  NewVT = MVT::v2i64; Scale = 2; break;
+  case MVT::v8i16:  NewVT = MVT::v4i32; Scale = 2; break;
+  case MVT::v16i8:  NewVT = MVT::v4i32; Scale = 4; break;
+  case MVT::v16i16: NewVT = MVT::v8i32; Scale = 2; break;
+  case MVT::v32i8:  NewVT = MVT::v8i32; Scale = 4; break;
   }
 
   SmallVector<int, 8> MaskVec;
@@ -6370,7 +6372,8 @@
 
   // If the shuffle can be profitably rewritten as a narrower shuffle, then
   // do it!
-  if (VT == MVT::v8i16 || VT == MVT::v16i8) {
+  if (VT == MVT::v8i16  || VT == MVT::v16i8 ||
+      VT == MVT::v16i16 || VT == MVT::v32i8) {
     SDValue NewOp = RewriteAsNarrowerShuffle(SVOp, DAG, dl);
     if (NewOp.getNode())
       return DAG.getNode(ISD::BITCAST, dl, VT, NewOp);

Modified: llvm/trunk/test/CodeGen/X86/avx-shuffle.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/avx-shuffle.ll?rev=156156&r1=156155&r2=156156&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/avx-shuffle.ll (original)
+++ llvm/trunk/test/CodeGen/X86/avx-shuffle.ll Thu May  3 23:44:49 2012
@@ -202,3 +202,11 @@
   %t = shufflevector <4 x i64> %a, <4 x i64> %b, <4 x i32> <i32 0, i32 1, i32 2, i32 7>
   ret <4 x i64> %t
 }
+
+; CHECK: narrow
+; CHECK: vpermilps
+; CHECK: ret
+define <16 x i16> @narrow(<16 x i16> %a) nounwind alwaysinline {
+  %t = shufflevector <16 x i16> %a, <16 x i16> undef, <16 x i32> <i32 2, i32 3, i32 undef, i32 1, i32 6, i32 7, i32 4, i32 5, i32 10, i32 11, i32 8, i32 undef, i32 14, i32 15, i32 undef, i32 undef>
+  ret <16 x i16> %t
+}