6afc3de42f
This is a small pet peeve from me. This change makes sure the AVR backend uses
the correct private label prefix (.L) so that private labels are hidden in
avr-objdump.
Example code:
define i8 @foo(i1 %cond) {
br i1 %cond, label %then, label %else
then:
ret i8 3
else:
ret i8 5
}
When compiling this:
llc -march=avr -filetype=obj -o test.o test.ll
and then dumping it:
avr-objdump -d test.o
You would previously get an ugly temporary label:
00000000 <foo>:
0: 81 70 andi r24, 0x01 ; 1
2: 80 30 cpi r24, 0x00 ; 0
4: f9 f3 breq .-2 ; 0x4 <foo+0x4>
6: 83 e0 ldi r24, 0x03 ; 3
8: 08 95 ret
0000000a <LBB0_2>:
a: 85 e0 ldi r24, 0x05 ; 5
c: 08 95 ret
This patch fixes that, the output is now:
00000000 <foo>:
0: 81 70 andi r24, 0x01 ; 1
2: 80 30 cpi r24, 0x00 ; 0
4: 01 f0 breq .+0 ; 0x6 <foo+0x6>
6: 83 e0 ldi r24, 0x03 ; 3
8: 08 95 ret
a: 85 e0 ldi r24, 0x05 ; 5
c: 08 95 ret
Note that as you can see the breq operand is different. However it is
still the same after linking:
4: 11 f0 breq .+4
Differential Revision: https://reviews.llvm.org/D75124
104 lines
2.0 KiB
LLVM
104 lines
2.0 KiB
LLVM
; RUN: llc < %s -march=avr -mcpu=atmega328p | FileCheck %s
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; This test checks a basic 'blinking led' program.
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; It is written for the ATmega328P
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; Derived from the following C program (with some cleanups):
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; #include <avr/io.h>
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;
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; void setup_ddr() {
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; DDRB |= _BV(PB5);
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; }
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;
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; void turn_on() {
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; PORTB |= _BV(PB5);
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; }
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;
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; void turn_off() {
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; PORTB &= ~_BV(PB5);
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; }
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;
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; int main() {
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; setup_ddr();
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;
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; while(1) {
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; turn_on();
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; turn_off();
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; }
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;
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; return 0;
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; }
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; Sets up the data direction register.
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; CHECK-LABEL: setup_ddr
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define void @setup_ddr() {
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entry:
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; This should set the 5th bit of DDRB.
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; CHECK: sbi 4, 5
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; CHECK-NEXT: ret
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%0 = load volatile i8, i8* inttoptr (i16 36 to i8*), align 1
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%conv = zext i8 %0 to i16
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%or = or i16 %conv, 32
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%conv1 = trunc i16 %or to i8
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store volatile i8 %conv1, i8* inttoptr (i16 36 to i8*), align 1
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ret void
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}
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; Turns on the LED.
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; CHECK-LABEL: turn_on
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define void @turn_on() {
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entry:
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; This should set the 5th bit of PORTB
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; CHECK: sbi 5, 5
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; CHECK-NEXT: ret
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%0 = load volatile i8, i8* inttoptr (i16 37 to i8*), align 1
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%conv = zext i8 %0 to i16
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%or = or i16 %conv, 32
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%conv1 = trunc i16 %or to i8
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store volatile i8 %conv1, i8* inttoptr (i16 37 to i8*), align 1
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ret void
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}
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; Turns off the LED.
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; CHECK-LABEL: turn_off
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define void @turn_off() {
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entry:
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; This should clear the 5th bit of PORTB
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; CHECK: cbi 5, 5
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; CHECK-NEXT: ret
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%0 = load volatile i8, i8* inttoptr (i16 37 to i8*), align 1
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%conv = zext i8 %0 to i16
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%and = and i16 %conv, -33
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%conv1 = trunc i16 %and to i8
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store volatile i8 %conv1, i8* inttoptr (i16 37 to i8*), align 1
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ret void
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}
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; CHECK-LABEL: main
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define i16 @main() {
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entry:
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; CHECK: call setup_ddr
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call void @setup_ddr()
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br label %while.body
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; CHECK-LABEL: .LBB3_1
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while.body:
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; CHECK: call turn_on
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call void @turn_on()
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; CHECK-NEXT: call turn_off
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call void @turn_off()
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; CHECK-NEXT: rjmp .LBB3_1
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br label %while.body
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}
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