[llvm] r330948 - [NVPTX] Make the legalizer expand shufflevector of <2 x half>

[Benjamin Kramer via llvm-commits]

Author: d0k
Date: Thu Apr 26 08:26:29 2018
New Revision: 330948

URL: http://llvm.org/viewvc/llvm-project?rev=330948&view=rev
Log:
[NVPTX] Make the legalizer expand shufflevector of <2 x half>

There's no direct instruction for this, but it's trivially implemented
with two movs. Without this the code generator just dies when
encountering a shufflevector.

Differential Revision: https://reviews.llvm.org/D46116

Modified:
    llvm/trunk/lib/Target/NVPTX/NVPTXISelLowering.cpp
    llvm/trunk/test/CodeGen/NVPTX/f16x2-instructions.ll

Modified: llvm/trunk/lib/Target/NVPTX/NVPTXISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/NVPTX/NVPTXISelLowering.cpp?rev=330948&r1=330947&r2=330948&view=diff
==============================================================================
--- llvm/trunk/lib/Target/NVPTX/NVPTXISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/NVPTX/NVPTXISelLowering.cpp Thu Apr 26 08:26:29 2018
@@ -375,6 +375,7 @@ NVPTXTargetLowering::NVPTXTargetLowering
   setOperationAction(ISD::FP_TO_SINT, MVT::f16, Legal);
   setOperationAction(ISD::BUILD_VECTOR, MVT::v2f16, Custom);
   setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f16, Custom);
+  setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2f16, Expand);
 
   setFP16OperationAction(ISD::SETCC, MVT::f16, Legal, Promote);
   setFP16OperationAction(ISD::SETCC, MVT::v2f16, Legal, Expand);

Modified: llvm/trunk/test/CodeGen/NVPTX/f16x2-instructions.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/NVPTX/f16x2-instructions.ll?rev=330948&r1=330947&r2=330948&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/NVPTX/f16x2-instructions.ll (original)
+++ llvm/trunk/test/CodeGen/NVPTX/f16x2-instructions.ll Thu Apr 26 08:26:29 2018
@@ -1423,5 +1423,13 @@ define <2 x half> @test_fmuladd(<2 x hal
   ret <2 x half> %r
 }
 
+; CHECK-LABEL: test_shufflevector(
+; CHECK: mov.b32 {%h1, %h2}, %hh1;
+; CHECK: mov.b32 %hh2, {%h2, %h1};
+define <2 x half> @test_shufflevector(<2 x half> %a) #0 {
+  %s = shufflevector <2 x half> %a, <2 x half> undef, <2 x i32> <i32 1, i32 0>
+  ret <2 x half> %s
+}
+
 attributes #0 = { nounwind }
 attributes #1 = { "unsafe-fp-math" = "true" }