https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38534
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2024-01-14
Status|UNCONFIRMED |NEW
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Lukas Grätz from comment #7)
> (In reply to H.J. Lu from comment #4)
> > When I compiled __cxxabiv1::__cxa_throw, which is a noreturn function in
> > libstdc++-v3/libsupc++/eh_throw.cc not to save callee-saved registers,
> > most of C++ exception tests crashed.
>
> Can you tell how you compiled it? Thanks in advance!
I have a patch to fix it. Please try users/hjl/pr113312/gcc-13 branch:
https://gitlab.com/x86-gcc/gcc/-/tree/users/hjl/pr113312/gcc-13?ref_type=heads
For your testcase, I got
.globl no_return_to_caller
.type no_return_to_caller, @function
no_return_to_caller:
.LFB0:
.cfi_startproc
subq $24, %rsp
.cfi_def_cfa_offset 32
movl $array+67108860, %eax
xorl %r13d, %r13d
movq %rax, 8(%rsp)
.L2:
movl $256, %ebp
movq 8(%rsp), %r12
movl $256, %ebx
subl %r13d, %ebp
.p2align 4,,10
.p2align 3
.L6:
movq %r12, %r14
movl $256, %r15d
.p2align 4,,10
.p2align 3
.L3:
movl %r15d, %edx
movl %ebx, %esi
movl %ebp, %edi
subl $1, %r15d
call value
subq $4, %r14
movl %eax, 4(%r14)
testl %r15d, %r15d
jne .L3
subq $1024, %r12
subl $1, %ebx
jne .L6
subq $262144, 8(%rsp)
addq $1, %r13
cmpq $256, %r13
jne .L2
.L5:
jmp .L5
.cfi_endproc
.LFE0:
.size no_return_to_caller, .-no_return_to_caller
