https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89627
Bug ID: 89627
Summary: Miscompiled constructor call
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: sch...@linux-m68k.org
CC: wilson at gcc dot gnu.org
Target Milestone: ---
Target: riscv64-*-*
$ cat bind2nd.cc
#include <iostream>
#include <functional>
int
main ()
{
auto b = std::bind2nd (std::divides<double> (), 2.0);
double v = b (1);
std::cout << "v = " << v << '\n';
}
$ g++ -g bind2nd.cc
$ ./a.out
v = Inf
I think the miscompilation occurs in the bind2nd function after the call to the
binder2nd constructor:
Dump of assembler code for function std::bind2nd<std::divides<double>,
double>(std::divides<double> const&, double const&):
0x0000000000010902 <+0>: addi sp,sp,-96
0x0000000000010904 <+2>: sd ra,88(sp)
0x0000000000010906 <+4>: sd s0,80(sp)
0x0000000000010908 <+6>: addi s0,sp,96
0x000000000001090a <+8>: sd a0,-72(s0)
0x000000000001090e <+12>: sd a1,-80(s0)
=> 0x0000000000010912 <+16>: ld a5,-80(s0)
0x0000000000010916 <+20>: fld fa5,0(a5)
0x0000000000010918 <+22>: fsd fa5,-24(s0)
0x000000000001091c <+26>: addi a4,s0,-24
0x0000000000010920 <+30>: addi a5,s0,-40
0x0000000000010924 <+34>: mv a2,a4
0x0000000000010926 <+36>: ld a1,-72(s0)
0x000000000001092a <+40>: mv a0,a5
0x000000000001092c <+42>: jal ra,0x10986
<std::binder2nd<std::divides<double> >::binder2nd(std::divides<double> const&,
double const&)>
0x0000000000010930 <+46>: ld a5,-40(s0)
0x0000000000010934 <+50>: sd a5,-56(s0)
0x0000000000010938 <+54>: ld a5,-32(s0)
0x000000000001093c <+58>: sd a5,-48(s0)
0x0000000000010940 <+62>: fld fa5,-56(s0)
0x0000000000010944 <+66>: fmv.d fa0,fa5
0x0000000000010948 <+70>: ld ra,88(sp)
0x000000000001094a <+72>: ld s0,80(sp)
0x000000000001094c <+74>: addi sp,sp,96
0x000000000001094e <+76>: ret
