1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
; RUN: llc -mtriple=aarch64-none-linux-gnu -filetype=obj < %s | llvm-objdump -disassemble - | 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(i32* %existing, i32* %new) {
; CHECK: bfxil {{w[0-9]+}}, {{w[0-9]+}}, #0, #18
%oldval = load volatile i32* %existing
%oldval_keep = and i32 %oldval, 4294705152 ; 0xfffc_0000
%newval = load volatile i32* %new
%newval_masked = and i32 %newval, 262143 ; = 0x0003_ffff
%combined = or i32 %newval_masked, %oldval_keep
store volatile i32 %combined, i32* %existing
ret void
}
|
