https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117466
Bug ID: 117466
Summary: brk #1000 rsp. ud2
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hans.buchmann.wantuch at gmail dot com
Target Milestone: ---
Created attachment 59546
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59546&action=edit
The code, the assembler outputs and the compiler versions
The code 'brk-1000.cc'
------8<------8<------8<------8<------
struct R
{
static const unsigned N=1;
unsigned v[N];
R(const unsigned in[])
{
for(unsigned i=0;auto& d:v)d=in[i++];
}
};
struct Card
{
R rca={0};
};
Card card;
------8<------8<------8<------8<------
compiled with:
CC=aarch64-linux-gnu-g++
${CC} -O2 -freport-bug -std=c++2a -Wall -Wextra \
-S -o brk-1000.s brk-1000.cc
results in the assembler output:
_GLOBAL__sub_I_card:
.LFB7:
.cfi_startproc
mov x0, 0
ldr w0, [x0]
brk #1000 //<---------------- why
.cfi_endproc
compiling the same code with g++
_GLOBAL__sub_I_card:
.LFB7:
.cfi_startproc
movl 0, %eax
ud2 //<---------------- why
.cfi_endproc
Sincerely
Hans Buchmann
