blink.ll
1.97 KB
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; 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 set the 5th bit of DDRB.
; CHECK: sbi 4, 5
; 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 set the 5th bit of PORTB
; CHECK: sbi 5, 5
; 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 clear the 5th bit of PORTB
; CHECK: cbi 5, 5
; 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
}