[PATCH] Implement aarch64 neon instruction class SIMD copy - LLVM

[Hao Liu]

Hi Kevin,

Just one minor issue in test/CodeGen/AArch64/neon-copy.ll:

define <8 x i8> @test_vcopy_lane_s8(<8 x i8> %v1, <8 x i8> %v2) {
;CHECK: ins v0.b[5], v1.b[3]
 %vset_lane = shufflevector <8 x i8> %v1, <8 x i8> %v2, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 11, i32 6, i32 7>
 ret <8 x i8> %vset_lane
}

The CHECK registers are fixed to v0 and v1. If the register allocating order is changed, the test may be failed. 
I just find other tests are using {{v[0-9]+}} instead.

Thanks,
-Hao

-----Original Message-----
From: cfe-commits-bounces at cs.uiuc.edu [mailto:cfe-commits-bounces at cs.uiuc.edu] On Behalf Of Kevin Qin
Sent: Tuesday, October 08, 2013 6:33 AM
To: kevinqindev at gmail.com; t.p.northover at gmail.com
Cc: llvm-commits at cs.uiuc.edu; cfe-commits at cs.uiuc.edu
Subject: [PATCH] Implement aarch64 neon instruction class SIMD copy - LLVM

This patch implemented aarch64 neon SIMD copy instruction class.
I rebased this patch on latest truck.

This patch contains:
1. Implemented SIMD dup instruction.
2. Remove DupImm, use VDUP instead.

Known problem:

1. In AAPCS64, half float can serve as setters and getters for function, so some ACLE intrinsic would receive or provide a variable with half float. But this feature isn't supported by Clang at moment. Even when I hack diagnose detector to avoid throwing error message, all half float will be converted to i16 in IR.
2. There is no v4f16 in IR, which is used by some ACLE intrinsic.

Considering above problem, all ACLE intrinsic with half float isn't implemented in these patches. We will try to figure out how to implement this feature.
Please review, thanks.

http://llvm-reviews.chandlerc.com/D1854

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/AArch64/AArch64InstrNEON.td
  lib/Target/AArch64/AArch64RegisterInfo.td
  test/CodeGen/AArch64/neon-copy.ll
  test/MC/AArch64/neon-diagnostics.s
  test/MC/AArch64/neon-simd-copy.s