| Jiangning Liu | b0f0769 | 2015-04-01 01:52:38 +0000 | [diff] [blame^] | 1 | ; RUN: llc < %s -mtriple=aarch64--linux-gnu | FileCheck %s |
| 2 | |
| 3 | ; PR23065: SCALAR_TO_VECTOR implies the top elements 1 to N-1 of the N-element vector are undefined. |
| 4 | |
| 5 | define <4 x i16> @foo1(<2 x i32> %a) { |
| 6 | ; CHECK-LABEL: foo1: |
| 7 | ; CHECK: movi d0, #0000000000000000 |
| 8 | ; CHECK-NEXT: ret |
| 9 | |
| 10 | %1 = shufflevector <2 x i32> <i32 58712, i32 undef>, <2 x i32> %a, <2 x i32> <i32 0, i32 2> |
| 11 | ; Can't optimize the following bitcast to scalar_to_vector. |
| 12 | %2 = bitcast <2 x i32> %1 to <4 x i16> |
| 13 | %3 = shufflevector <4 x i16> %2, <4 x i16> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> |
| 14 | ret <4 x i16> %3 |
| 15 | } |
| 16 | |
| 17 | define <4 x i16> @foo2(<2 x i32> %a) { |
| 18 | ; CHECK-LABEL: foo2: |
| 19 | ; CHECK: movi d0, #0000000000000000 |
| 20 | ; CHECK-NEXT: ret |
| 21 | |
| 22 | %1 = shufflevector <2 x i32> <i32 712, i32 undef>, <2 x i32> %a, <2 x i32> <i32 0, i32 2> |
| 23 | ; Can't optimize the following bitcast to scalar_to_vector. |
| 24 | %2 = bitcast <2 x i32> %1 to <4 x i16> |
| 25 | %3 = shufflevector <4 x i16> %2, <4 x i16> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> |
| 26 | ret <4 x i16> %3 |
| 27 | } |