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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/113907] [11/12/13/14 regression] ICU miscompiled since on
 x86 since r14-5109-ga291237b628f41
Date: Thu, 14 Mar 2024 16:20:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113907

--- Comment #58 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Created attachment 57702
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57702&action=3Dedit
Compare value ranges in jump functions

This patch implements the jump function compare, however it is not good eno=
ugh.
 Here is another wrong code:

jh@ryzen3:~/gcc/build/stage1-gcc> cat a.c
#include <stddef.h>
#include <stdlib.h>

__attribute__((used)) int val,val2 =3D 1;

struct foo {int a;};

struct foo **ptr;

__attribute__ ((noipa))
int
test2 (void *a)
{=20
  ptr =3D (struct foo **)a;
}
int test3 (void *a);

int
test(void)
{=20
  struct foo *fp;
  test2 ((void *)&fp);
  fp =3D NULL;
  (*ptr)++;
  test3 ((void *)&fp);
}

int testb (void);

int
main()
{=20
  for (int i =3D 0; i < val2; i++)
  if (val)
    testb ();
  else
    test();
}
jh@ryzen3:~/gcc/build/stage1-gcc> cat b.c
#include <stdlib.h>
struct bar {int a;};
struct foo {int a;};
struct barp {struct bar *f; struct bar *g;};
extern struct foo **ptr;
int test2 (void *);
int test3 (void *);
int
testb(void)
{
  struct bar *fp;
  test2 ((void *)&fp);
  fp =3D NULL;
  (*ptr)++;
  test3 ((void *)&fp);
}
jh@ryzen3:~/gcc/build/stage1-gcc> cat c.c
#include <stdlib.h>
__attribute__ ((noinline))
int
test3 (void *a)
{
  if (!*(void **)a)
          abort ();
  return 0;
}
jh@ryzen3:~/gcc/build/stage1-gcc> ./xgcc -B ./ -O3 a.c b.c -flto -c ; ./xgc=
c -B
./ -O3 c.c -flto -fno-strict-aliasing -c ; ./xgcc  -B ./ b.o a.o c.o ; ./a.=
out
Aborted (core dumped)
jh@ryzen3:~/gcc/build/stage1-gcc> ./xgcc -B ./ -O3 a.c b.c -flto -c ; ./xgc=
c -B
./ -O3 c.c -flto -fno-strict-aliasing -c ; ./xgcc  -B ./ b.o a.o c.o
--disable-ipa-icf ; ./a.out=20
lto1: note: disable pass ipa-icf for functions in the range of [0, 42949672=
95]
lto1: note: disable pass ipa-icf for functions in the range of [0, 42949672=
95]=