https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114132
Bug ID: 114132
Summary: [avr] Code sets up a frame pointer without need
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: gjl at gcc dot gnu.org
Target Milestone: ---
$ avr-gcc -S -Os -mmcu=attiny40
of
void funcab_c (long x, char c) {
}
sets up a frame-pointer without need.
Arguments x and c occupy all of the argument registers R25..R20, so that no arg
registers are left. Then there is this implementation of
TARGET_FRAME_POINTER_REQUIRED in avr.cc:
static bool
avr_frame_pointer_required_p (void)
{
return (cfun->calls_alloca
|| cfun->calls_setjmp
|| cfun->has_nonlocal_label
|| crtl->args.info.nregs == 0
|| get_frame_size () > 0);
}
Problem is that crtl->args.info.nregs == 0 does not discriminate between need
for arg pointer and no need for arg pointer (but all arg regs are used up, like
in the example).
