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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
32 lines
982 B
LLVM
32 lines
982 B
LLVM
; RUN: llc -mattr=avr6 < %s -march=avr | FileCheck %s
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define i1 @signed_multiplication_did_overflow(i8, i8) unnamed_addr {
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; CHECK-LABEL: signed_multiplication_did_overflow:
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entry-block:
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%2 = tail call { i8, i1 } @llvm.smul.with.overflow.i8(i8 %0, i8 %1)
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%3 = extractvalue { i8, i1 } %2, 1
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ret i1 %3
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; Multiply, fill the low byte with the sign of the low byte via
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; arithmetic shifting, compare it to the high byte.
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;
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; CHECK: muls r24, r22
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; CHECK: mov [[HIGH:r[0-9]+]], r1
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; CHECK: mov [[LOW:r[0-9]+]], r0
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; CHECK: asr {{.*}}[[LOW]]
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; CHECK: asr {{.*}}[[LOW]]
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; CHECK: asr {{.*}}[[LOW]]
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; CHECK: asr {{.*}}[[LOW]]
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; CHECK: asr {{.*}}[[LOW]]
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; CHECK: asr {{.*}}[[LOW]]
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; CHECK: asr {{.*}}[[LOW]]
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; CHECK: ldi [[RET:r[0-9]+]], 1
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; CHECK: cp {{.*}}[[HIGH]], {{.*}}[[LOW]]
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; CHECK: brne [[LABEL:.LBB[_0-9]+]]
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; CHECK: ldi {{.*}}[[RET]], 0
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; CHECK: {{.*}}[[LABEL]]
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; CHECK: ret
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}
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declare { i8, i1 } @llvm.smul.with.overflow.i8(i8, i8)
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