[PATCH] [AArch64]Add code to copy FPR8 in CopyPhysReg

[Hao Liu]

Hi t.p.northover,

Hi Tim and reviewers,

This patch add code to copy FPR8 in CopyPhysReg(). The implementation is like FPR16 and FPR32 by using FMOV.

Review, please.

Thanks,
-Hao

http://llvm-reviews.chandlerc.com/D2611

Files:
  lib/Target/AArch64/AArch64InstrInfo.cpp
  test/CodeGen/AArch64/neon-copy.ll

Index: lib/Target/AArch64/AArch64InstrInfo.cpp
===================================================================
--- lib/Target/AArch64/AArch64InstrInfo.cpp
+++ lib/Target/AArch64/AArch64InstrInfo.cpp
@@ -142,6 +142,16 @@
     BuildMI(MBB, I, DL, get(AArch64::FMOVss), Dst)
       .addReg(Src);
     return;
+  } else if (AArch64::FPR8RegClass.contains(DestReg, SrcReg)) {
+    // The copy of two FPR8 registers is implemented by the copy of two FPR32
+    const TargetRegisterInfo *TRI = &getRegisterInfo();
+    unsigned Dst = TRI->getMatchingSuperReg(DestReg, AArch64::sub_8,
+                                            &AArch64::FPR32RegClass);
+    unsigned Src = TRI->getMatchingSuperReg(SrcReg, AArch64::sub_8,
+                                            &AArch64::FPR32RegClass);
+    BuildMI(MBB, I, DL, get(AArch64::FMOVss), Dst)
+      .addReg(Src);
+    return;
   } else {
     CopyPhysRegTuple(MBB, I, DL, DestReg, SrcReg);
     return;
Index: test/CodeGen/AArch64/neon-copy.ll
===================================================================
--- test/CodeGen/AArch64/neon-copy.ll
+++ test/CodeGen/AArch64/neon-copy.ll
@@ -1274,3 +1274,14 @@
   %vsqadd2.i = call <1 x i16> @llvm.aarch64.neon.vsqadd.v1i16(<1 x i16> %b, <1 x i16> %a)
   ret <1 x i16> %vsqadd2.i
 }
+
+define <1 x i8> @test_copy_FPR8_FPR8(<1 x i8> %a, <1 x i8> %b) {
+; CHECK-LABEL: test_copy_FPR8_FPR8:
+; CHECK: usqadd b1, b0
+; CHECK-NEXT: fmov s0, s1
+entry:
+ %vsqadd2.i = call <1 x i8> @llvm.aarch64.neon.vsqadd.v1i8(<1 x i8> %b, <1 x i8> %a)
+ ret <1 x i8> %vsqadd2.i
+}
+
+declare <1 x i8> @llvm.aarch64.neon.vsqadd.v1i8(<1 x i8>, <1 x i8>)
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