1; RUN: llc < %s -march=avr -mcpu=atmega328p | FileCheck %s
2
3; This test checks a basic 'blinking led' program.
4; It is written for the ATmega328P
5
6; Derived from the following C program (with some cleanups):
7; #include <avr/io.h>
8;
9; void setup_ddr() {
10;   DDRB |= _BV(PB5);
11; }
12;
13; void turn_on() {
14;   PORTB |= _BV(PB5);
15; }
16;
17; void turn_off() {
18;   PORTB &= ~_BV(PB5);
19; }
20;
21; int main() {
22;   setup_ddr();
23;
24;   while(1) {
25;     turn_on();
26;     turn_off();
27;   }
28;
29;   return 0;
30; }
31
32; Sets up the data direction register.
33; CHECK-LABEL: setup_ddr
34define void @setup_ddr() {
35entry:
36
37  ; This should set the 5th bit of DDRB.
38  ; CHECK:      sbi	4, 5
39  ; CHECK-NEXT: ret
40
41  %0 = load volatile i8, i8* inttoptr (i16 36 to i8*), align 1
42  %conv = zext i8 %0 to i16
43  %or = or i16 %conv, 32
44  %conv1 = trunc i16 %or to i8
45  store volatile i8 %conv1, i8* inttoptr (i16 36 to i8*), align 1
46  ret void
47}
48
49; Turns on the LED.
50; CHECK-LABEL: turn_on
51define void @turn_on() {
52entry:
53
54  ; This should set the 5th bit of PORTB
55  ; CHECK:      sbi	5, 5
56  ; CHECK-NEXT: ret
57
58  %0 = load volatile i8, i8* inttoptr (i16 37 to i8*), align 1
59  %conv = zext i8 %0 to i16
60  %or = or i16 %conv, 32
61  %conv1 = trunc i16 %or to i8
62  store volatile i8 %conv1, i8* inttoptr (i16 37 to i8*), align 1
63  ret void
64}
65
66; Turns off the LED.
67; CHECK-LABEL: turn_off
68define void @turn_off() {
69entry:
70
71  ; This should clear the 5th bit of PORTB
72  ; CHECK:      cbi     5, 5
73  ; CHECK-NEXT: ret
74
75  %0 = load volatile i8, i8* inttoptr (i16 37 to i8*), align 1
76  %conv = zext i8 %0 to i16
77  %and = and i16 %conv, -33
78  %conv1 = trunc i16 %and to i8
79  store volatile i8 %conv1, i8* inttoptr (i16 37 to i8*), align 1
80  ret void
81}
82
83; CHECK-LABEL: main
84define i16 @main() {
85entry:
86
87  ; CHECK: call setup_ddr
88  call void @setup_ddr()
89
90  br label %while.body
91
92; CHECK-LABEL: .LBB3_1
93while.body:
94
95  ; CHECK: call turn_on
96  call void @turn_on()
97
98  ; CHECK-NEXT: call turn_off
99  call void @turn_off()
100
101  ; CHECK-NEXT: rjmp .LBB3_1
102  br label %while.body
103}
104