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8f4cb72386
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
97 lines
2.9 KiB
LLVM
97 lines
2.9 KiB
LLVM
; RUN: llc < %s -march=avr | FileCheck %s
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; CHECK-LABEL: relax_breq
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; CHECK: cpi r{{[0-9]+}}, 0
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; CHECK: brne .LBB0_1
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; CHECK: rjmp .LBB0_2
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; .LBB0_1:
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define i8 @relax_breq(i1 %a) {
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entry-block:
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br i1 %a, label %hello, label %finished
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hello:
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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br label %finished
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finished:
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ret i8 3
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}
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; CHECK-LABEL: no_relax_breq
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; CHECK: cpi r{{[0-9]+}}, 0
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; CHECK: breq [[END_BB:.LBB[0-9]+_[0-9]+]]
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; CHECK: nop
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; ...
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; .LBB0_1:
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define i8 @no_relax_breq(i1 %a) {
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entry-block:
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br i1 %a, label %hello, label %finished
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hello:
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; There are not enough NOPs to require relaxation.
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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call void asm sideeffect "nop", ""()
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br label %finished
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finished:
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ret i8 3
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}
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