File: bitfield-insert-0.ll

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (19 lines) | stat: -rw-r--r-- 650 bytes parent folder | download | duplicates (14) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
; RUN: llc -mtriple=aarch64-linux-gnu -filetype=obj -o - %s | llvm-objdump -d - | FileCheck %s

; The encoding of lsb -> immr in the CGed bitfield instructions was wrong at one
; point, in the edge case where lsb = 0. Just make sure.

define void @test_bfi0(ptr %existing, ptr %new) {
; CHECK: bfxil {{w[0-9]+}}, {{w[0-9]+}}, #0, #18

  %oldval = load volatile i32, ptr %existing
  %oldval_keep = and i32 %oldval, 4294705152 ; 0xfffc_0000

  %newval = load volatile i32, ptr %new
  %newval_masked = and i32 %newval, 262143 ; = 0x0003_ffff

  %combined = or i32 %newval_masked, %oldval_keep
  store volatile i32 %combined, ptr %existing

  ret void
}