File: bitcast.ll

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-11
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,418,840 kB
  • sloc: cpp: 5,290,826; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,898; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,913; xml: 953; cs: 573; fortran: 539
file content (27 lines) | stat: -rw-r--r-- 1,049 bytes parent folder | download | duplicates (16) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
 
; 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	v0.2d, #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	v0.2d, #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
}