or-combine.ll
1.09 KB
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
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
; RUN: llc -mtriple=aarch64-linux-gnu -o - %s | FileCheck %s
define i32 @test_consts(i32 %in) {
; CHECK-LABEL: test_consts:
; CHECK-NOT: bfxil
; CHECK-NOT: and
; CHECK-NOT: orr
; CHECK: ret
%lo = and i32 %in, 65535
%hi = and i32 %in, -65536
%res = or i32 %lo, %hi
ret i32 %res
}
define i32 @test_generic(i32 %in, i32 %mask1, i32 %mask2) {
; CHECK-LABEL: test_generic:
; CHECK: orr [[FULL_MASK:w[0-9]+]], w1, w2
; CHECK: and w0, w0, [[FULL_MASK]]
%lo = and i32 %in, %mask1
%hi = and i32 %in, %mask2
%res = or i32 %lo, %hi
ret i32 %res
}
; In this case the transformation isn't profitable, since %lo and %hi
; are used more than once.
define [3 x i32] @test_reuse(i32 %in, i32 %mask1, i32 %mask2) {
; CHECK-LABEL: test_reuse:
; CHECK-DAG: and w1, w0, w1
; CHECK-DAG: and w2, w0, w2
; CHECK-DAG: orr w0, w1, w2
%lo = and i32 %in, %mask1
%hi = and i32 %in, %mask2
%recombine = or i32 %lo, %hi
%res.tmp0 = insertvalue [3 x i32] undef, i32 %recombine, 0
%res.tmp1 = insertvalue [3 x i32] %res.tmp0, i32 %lo, 1
%res = insertvalue [3 x i32] %res.tmp1, i32 %hi, 2
ret [3 x i32] %res
}