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From: "tuliom at linux dot vnet.ibm.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/67281] HTM builtins aren't treated as compiler barriers on powerpc
Date: Wed, 19 Aug 2015 18:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67281

--- Comment #2 from Tulio Magno Quites Machado Filho <tuliom at linux dot vnet.ibm.com> ---
Oooops.  My bad.
What about this one?

$ cat tbegin-barrier.c
long
foo (long dest, long *src0, long src1, long tries)
{
  long i;
  for (i = 0; i < tries; i++)
    {
      __builtin_tbegin (0);
      dest = *src0 + src1;
      __builtin_tend (0);
    }
  return dest;
}

If we compile it the same way:

foo:
        cmpdi 0,6,0
        blelr 0
        mtctr 6
        ld 3,0(4)
        .p2align 4,,15
.L3:
        tbegin. 0
        tend. 0
        bdnz .L3
        add 3,3,5
        blr