[AArch64][SVE] Asm: Support for COMPACT instruction.

The compact instruction shuffles active elements of vector
into lowest numbered elements and sets remaining elements
to zero. 

e.g.
  compact z0.s, p0, z1.s

llvm-svn: 336789

2 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td b/llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
index d747d76fab5..dc28f14a59d 100644
--- a/llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
+++ b/llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
@@ -112,6 +112,8 @@ let Predicates = [HasSVE] in {
   // Select elements from either vector (predicated)
   defm SEL_ZPZZ    : sve_int_sel_vvv<"sel">;
 
+  defm COMPACT_ZPZ : sve_int_perm_compact<"compact">;
+
   def AND_PPzPP   : sve_int_pred_log<0b0000, "and">;
   def BIC_PPzPP   : sve_int_pred_log<0b0001, "bic">;
   def EOR_PPzPP   : sve_int_pred_log<0b0010, "eor">;
diff --git a/llvm/lib/Target/AArch64/SVEInstrFormats.td b/llvm/lib/Target/AArch64/SVEInstrFormats.td
index b8e67f6ab04..de9cb79d246 100644
--- a/llvm/lib/Target/AArch64/SVEInstrFormats.td
+++ b/llvm/lib/Target/AArch64/SVEInstrFormats.td
@@ -2574,6 +2574,28 @@ multiclass sve_int_perm_cpy_v<string asm> {
                   (!cast<Instruction>(NAME # _D) ZPR64:$Zd, PPR3bAny:$Pg, FPR64:$Vn), 1>;
 }
 
+class sve_int_perm_compact<bit sz, string asm, ZPRRegOp zprty>
+: I<(outs zprty:$Zd), (ins PPR3bAny:$Pg, zprty:$Zn),
+  asm, "\t$Zd, $Pg, $Zn",
+  "",
+  []>, Sched<[]> {
+  bits<3> Pg;
+  bits<5> Zd;
+  bits<5> Zn;
+  let Inst{31-23} = 0b000001011;
+  let Inst{22}    = sz;
+  let Inst{21-13} = 0b100001100;
+  let Inst{12-10} = Pg;
+  let Inst{9-5}   = Zn;
+  let Inst{4-0}   = Zd;
+}
+
+multiclass sve_int_perm_compact<string asm> {
+  def _S : sve_int_perm_compact<0b0, asm, ZPR32>;
+  def _D : sve_int_perm_compact<0b1, asm, ZPR64>;
+}
+
+
 //===----------------------------------------------------------------------===//
 // SVE Memory - Contiguous Load Group
 //===----------------------------------------------------------------------===//