src/third_party/llvm-project/llvm/test/CodeGen/AVR/integration/blink.ll

; RUN: llc < %s -march=avr -mcpu=atmega328p | FileCheck %s

; This test checks a basic 'blinking led' program.
; It is written for the ATmega328P

; Derived from the following C program (with some cleanups):
; #include <avr/io.h>
;
; void setup_ddr() {
;   DDRB |= _BV(PB5);
; }
;
; void turn_on() {
;   PORTB |= _BV(PB5);
; }
;
; void turn_off() {
;   PORTB &= ~_BV(PB5);
; }
;
; int main() {
;   setup_ddr();
;
;   while(1) {
;     turn_on();
;     turn_off();
;   }
;
;   return 0;
; }

; Sets up the data direction register.
; CHECK-LABEL: setup_ddr
define void @setup_ddr() {
entry:

  ; This should load the value of DDRB, OR it with the bit number and store
  ; the result back to DDRB.

  ; CHECK:      in      [[TMPREG:r[0-9]+]], 4
  ; CHECK-NEXT: ori     [[TMPREG]], 32

  ; CHECK-NOT: ori     {{r[0-9]+}}, 0

  ; CHECK-NEXT: out     4, [[TMPREG]]
  ; CHECK-NEXT: ret

  %0 = load volatile i8, i8* inttoptr (i16 36 to i8*), align 1
  %conv = zext i8 %0 to i16
  %or = or i16 %conv, 32
  %conv1 = trunc i16 %or to i8
  store volatile i8 %conv1, i8* inttoptr (i16 36 to i8*), align 1
  ret void
}

; Turns on the LED.
; CHECK-LABEL: turn_on
define void @turn_on() {
entry:

  ; This should load the value of PORTB, OR it with the bit number and store
  ; the result back to DDRB.

  ; CHECK:      in      [[TMPREG:r[0-9]+]], 5
  ; CHECK-NEXT: ori     [[TMPREG]], 32

  ; CHECK-NOT: ori     {{r[0-9]+}}, 0

  ; CHECK-NEXT: out     5, [[TMPREG]]
  ; CHECK-NEXT: ret

  %0 = load volatile i8, i8* inttoptr (i16 37 to i8*), align 1
  %conv = zext i8 %0 to i16
  %or = or i16 %conv, 32
  %conv1 = trunc i16 %or to i8
  store volatile i8 %conv1, i8* inttoptr (i16 37 to i8*), align 1
  ret void
}

; Turns off the LED.
; CHECK-LABEL: turn_off
define void @turn_off() {
entry:

  ; This should load the value of PORTB, OR it with the bit number and store
  ; the result back to DDRB.


  ; CHECK:      in      [[TMPREG:r[0-9]+]], 5
  ; CHECK-NEXT: andi    [[TMPREG]], 223
  ; CHECK-NEXT: andi    {{r[0-9]+}}, 0
  ; CHECK-NEXT: out     5, [[TMPREG]]
  ; CHECK-NEXT: ret

  %0 = load volatile i8, i8* inttoptr (i16 37 to i8*), align 1
  %conv = zext i8 %0 to i16
  %and = and i16 %conv, -33
  %conv1 = trunc i16 %and to i8
  store volatile i8 %conv1, i8* inttoptr (i16 37 to i8*), align 1
  ret void
}

; CHECK-LABEL: main
define i16 @main() {
entry:

  ; CHECK: call setup_ddr
  call void @setup_ddr()

  br label %while.body

; CHECK-LABEL: LBB3_1
while.body:

  ; CHECK: call turn_on
  call void @turn_on()

  ; CHECK-NEXT: call turn_off
  call void @turn_off()

  ; CHECK-NEXT: rjmp LBB3_1
  br label %while.body
}