[Bug target/83111] [sh] stack smashing detected in gen_udivsi3

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83111

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |sh

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Looking at insn-emit.c, we see:
...
/* src/gcc/config/sh/sh.md:2273 */
rtx
gen_udivsi3 (rtx operand0,
        rtx operand1,
        rtx operand2)
{
  rtx_insn *_val = 0;
  start_sequence ();
  {
    rtx operands[3];
    operands[0] = operand0;
    operands[1] = operand1;
    operands[2] = operand2;
#define FAIL return (end_sequence (), _val)
#define DONE return (_val = get_insns (),end_sequence (), _val)
// #line 2278 "src/gcc/config/sh/sh.md"                                
{
  rtx last;

  operands[3] = gen_reg_rtx (Pmode);
...

In other words, we declare an array with size 3: "rtx operands[3]", and then
write the 4th element: "operands[3] = gen_reg_rtx (Pmode)".