source: icGREP/icgrep-devel/llvm-3.8.0.src/test/CodeGen/AArch64/bitreverse.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

Upgrade to llvm 3.8

File size: 2.8 KB
Line 
1; RUN: llc -mtriple=aarch64-eabi %s -o - | FileCheck %s
2
3; These tests just check that the plumbing is in place for @llvm.bitreverse. The
4; actual output is massive at the moment as llvm.bitreverse is not yet legal.
5
6declare <2 x i16> @llvm.bitreverse.v2i16(<2 x i16>) readnone
7
8define <2 x i16> @f(<2 x i16> %a) {
9; CHECK-LABEL: f:
10; CHECK: ushr
11  %b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %a)
12  ret <2 x i16> %b
13}
14
15declare i8 @llvm.bitreverse.i8(i8) readnone
16
17; Unfortunately some of the shift-and-inserts become BFIs, and some do not :(
18define i8 @g(i8 %a) {
19; CHECK-LABEL: g:
20; CHECK-DAG: lsr [[S5:w.*]], w0, #5
21; CHECK-DAG: lsr [[S4:w.*]], w0, #4
22; CHECK-DAG: lsr [[S3:w.*]], w0, #3
23; CHECK-DAG: lsr [[S2:w.*]], w0, #2
24; CHECK-DAG: lsl [[L1:w.*]], w0, #29
25; CHECK-DAG: lsl [[L2:w.*]], w0, #19
26; CHECK-DAG: lsl [[L3:w.*]], w0, #17
27
28; CHECK-DAG: and [[T1:w.*]], [[L1]], #0x40000000
29; CHECK-DAG: bfi [[T1]], w0, #31, #1
30; CHECK-DAG: bfi [[T1]], [[S2]], #29, #1
31; CHECK-DAG: bfi [[T1]], [[S3]], #28, #1
32; CHECK-DAG: bfi [[T1]], [[S4]], #27, #1
33; CHECK-DAG: bfi [[T1]], [[S5]], #26, #1
34; CHECK-DAG: and [[T2:w.*]], [[L2]], #0x2000000
35; CHECK-DAG: and [[T3:w.*]], [[L3]], #0x1000000
36; CHECK-DAG: orr [[T4:w.*]], [[T1]], [[T2]]
37; CHECK-DAG: orr [[T5:w.*]], [[T4]], [[T3]]
38; CHECK:     lsr w0, [[T5]], #24
39
40  %b = call i8 @llvm.bitreverse.i8(i8 %a)
41  ret i8 %b
42}
43
44declare <8 x i8> @llvm.bitreverse.v8i8(<8 x i8>) readnone
45
46define <8 x i8> @g_vec(<8 x i8> %a) {
47; Try and match as much of the sequence as precisely as possible.
48
49; CHECK-LABEL: g_vec:
50; CHECK-DAG: movi [[M1:v.*]], #0x80
51; CHECK-DAG: movi [[M2:v.*]], #0x40
52; CHECK-DAG: movi [[M3:v.*]], #0x20
53; CHECK-DAG: movi [[M4:v.*]], #0x10
54; CHECK-DAG: movi [[M5:v.*]], #0x8
55; CHECK-DAG: movi [[M6:v.*]], #0x4{{$}}
56; CHECK-DAG: movi [[M7:v.*]], #0x2{{$}}
57; CHECK-DAG: movi [[M8:v.*]], #0x1{{$}}
58; CHECK-DAG: shl  [[S1:v.*]], v0.8b, #7
59; CHECK-DAG: shl  [[S2:v.*]], v0.8b, #5
60; CHECK-DAG: shl  [[S3:v.*]], v0.8b, #3
61; CHECK-DAG: shl  [[S4:v.*]], v0.8b, #1
62; CHECK-DAG: ushr [[S5:v.*]], v0.8b, #1
63; CHECK-DAG: ushr [[S6:v.*]], v0.8b, #3
64; CHECK-DAG: ushr [[S7:v.*]], v0.8b, #5
65; CHECK-DAG: ushr [[S8:v.*]], v0.8b, #7
66; CHECK-DAG: and  [[A1:v.*]], [[S1]], [[M1]]
67; CHECK-DAG: and  [[A2:v.*]], [[S2]], [[M2]]
68; CHECK-DAG: and  [[A3:v.*]], [[S3]], [[M3]]
69; CHECK-DAG: and  [[A4:v.*]], [[S4]], [[M4]]
70; CHECK-DAG: and  [[A5:v.*]], [[S5]], [[M5]]
71; CHECK-DAG: and  [[A6:v.*]], [[S6]], [[M6]]
72; CHECK-DAG: and  [[A7:v.*]], [[S7]], [[M7]]
73; CHECK-DAG: and  [[A8:v.*]], [[S8]], [[M8]]
74
75; The rest can be ORRed together in any order; it's not worth the test
76; maintenance to match them precisely.
77; CHECK-DAG: orr
78; CHECK-DAG: orr
79; CHECK-DAG: orr
80; CHECK-DAG: orr
81; CHECK-DAG: orr
82; CHECK-DAG: orr
83; CHECK-DAG: orr
84; CHECK: ret
85  %b = call <8 x i8> @llvm.bitreverse.v8i8(<8 x i8> %a)
86  ret <8 x i8> %b
87}
Note: See TracBrowser for help on using the repository browser.