| ; RUN: llc < %s -mtriple=aarch64--linux-gnu | FileCheck %s |
| |
| ; PR23065: SCALAR_TO_VECTOR implies the top elements 1 to N-1 of the N-element vector are undefined. |
| |
| define <4 x i16> @foo1(<2 x i32> %a) { |
| ; CHECK-LABEL: foo1: |
| ; CHECK: movi d0, #0000000000000000 |
| ; CHECK-NEXT: ret |
| |
| %1 = shufflevector <2 x i32> <i32 58712, i32 undef>, <2 x i32> %a, <2 x i32> <i32 0, i32 2> |
| ; Can't optimize the following bitcast to scalar_to_vector. |
| %2 = bitcast <2 x i32> %1 to <4 x i16> |
| %3 = shufflevector <4 x i16> %2, <4 x i16> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> |
| ret <4 x i16> %3 |
| } |
| |
| define <4 x i16> @foo2(<2 x i32> %a) { |
| ; CHECK-LABEL: foo2: |
| ; CHECK: movi d0, #0000000000000000 |
| ; CHECK-NEXT: ret |
| |
| %1 = shufflevector <2 x i32> <i32 712, i32 undef>, <2 x i32> %a, <2 x i32> <i32 0, i32 2> |
| ; Can't optimize the following bitcast to scalar_to_vector. |
| %2 = bitcast <2 x i32> %1 to <4 x i16> |
| %3 = shufflevector <4 x i16> %2, <4 x i16> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> |
| ret <4 x i16> %3 |
| } |