[PATCH] D26536: [PPC] Add intrinsic mapping to the xscvhpsp instruction (VSX Scalar Convert Half-Precision to Single-Precision)

[Sean Fertile via llvm-commits]

sfertile created this revision.
sfertile added reviewers: kbarton, jtony, amehsan, nemanjai, lei, syzaara.
sfertile added subscribers: llvm-commits, echristo.
sfertile set the repository for this revision to rL LLVM.

Adds a new intrinsic mapping to the xscvhpsp instruction. 
A separate pattern has to be used for the match so that the argument can be converted from a VRRC register type to a VSRC register type.


Repository:
  rL LLVM

https://reviews.llvm.org/D26536

Files:
  include/llvm/IR/IntrinsicsPowerPC.td
  lib/Target/PowerPC/PPCInstrVSX.td
  test/CodeGen/PowerPC/vsx-p9.ll


Index: test/CodeGen/PowerPC/vsx-p9.ll
===================================================================
--- test/CodeGen/PowerPC/vsx-p9.ll
+++ test/CodeGen/PowerPC/vsx-p9.ll
@@ -190,4 +190,16 @@
 ; Function Attrs: nounwind readnone
 declare <16 x i8> @llvm.ppc.altivec.vsrv(<16 x i8>, <16 x i8>)
 
+; Function Attrs: nounwind readnone
+define <4 x float> @testXVCVHPSP(<8 x i16> %a) {
+entry:
+  %0 = tail call <4 x float>@llvm.ppc.vsx.xvcvhpsp(<8 x i16> %a)
+  ret <4 x float> %0
+; CHECK-LABEL: testXVCVHPSP
+; CHECK: xvcvhpsp 34, 34
+; CHECK: blr
+}
+; Function Attrs: nounwind readnone
+declare <4 x float>@llvm.ppc.vsx.xvcvhpsp(<8 x i16>)
+
 declare void @sink(...)
Index: lib/Target/PowerPC/PPCInstrVSX.td
===================================================================
--- lib/Target/PowerPC/PPCInstrVSX.td
+++ lib/Target/PowerPC/PPCInstrVSX.td
@@ -2124,6 +2124,7 @@
   def XSCVSDQP  : X_VT5_XO5_VB5_TyVB<63, 10, 836, "xscvsdqp", vfrc, []>;
   def XSCVUDQP  : X_VT5_XO5_VB5_TyVB<63,  2, 836, "xscvudqp", vfrc, []>;
 
+  let UseVSXReg = 1 in {
   //===--------------------------------------------------------------------===//
   // Round to Floating-Point Integer Instructions
 
@@ -2137,6 +2138,13 @@
   // Vector HP -> SP
   def XVCVHPSP : XX2_XT6_XO5_XB6<60, 24, 475, "xvcvhpsp", vsrc, []>;
   def XVCVSPHP : XX2_XT6_XO5_XB6<60, 25, 475, "xvcvsphp", vsrc, []>;
+  } // UseVSXReg = 1
+
+  // Pattern for matching Vector HP -> Vector SP intrinsic. Defined as a
+  // seperate pattern so that it can convert the input register class from
+  // VRRC(v8i16) to VSRC.
+  def : Pat<(v4f32 (int_ppc_vsx_xvcvhpsp v8i16:$A)),
+            (XVCVHPSP (COPY_TO_REGCLASS $A, VSRC))>;
 
   class Z23_VT5_R1_VB5_RMC2_EX1<bits<6> opcode, bits<8> xo, bit ex, string opc,
                                 list<dag> pattern>
Index: include/llvm/IR/IntrinsicsPowerPC.td
===================================================================
--- include/llvm/IR/IntrinsicsPowerPC.td
+++ include/llvm/IR/IntrinsicsPowerPC.td
@@ -806,6 +806,9 @@
 def int_ppc_vsx_xviexpsp :
       PowerPC_VSX_Intrinsic<"xviexpsp",[llvm_v4f32_ty],
                             [llvm_v4i32_ty, llvm_v4i32_ty],[IntrNoMem]>;
+def int_ppc_vsx_xvcvhpsp :
+      PowerPC_VSX_Intrinsic<"xvcvhpsp", [llvm_v4f32_ty],
+                            [llvm_v8i16_ty],[IntrNoMem]>;
 }
 
 //===----------------------------------------------------------------------===//


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