r268240 - in /trunk/gcc: ChangeLog profile-count.h

[rearnsha@gcc.gnu.org]

Author: rearnsha
Date: Thu Jan 24 16:06:34 2019
New Revision: 268240

URL: https://gcc.gnu.org/viewcvs?rev=268240&root=gcc&view=rev
Log:
Mitigation for PR target/88469 on arm-based systems bootstrapping with gcc-6/7/8

This patch, for gcc 8/9 is a mitigation patch for PR target/88469
where gcc-6/7/8 miscompile a structure whose alignment is dominated by
a 64-bit bitfield member.  Since the PCS rules for such a type must
ignore any overalignment of the base type we cannot address this by
simply adding a larger alignment to the class.  We can, however, force
the alignment of the bit-field itself and GCC will handle that as
desired.

	PR target/88469
	* profile-count.h (profile_count): On ARM systems using GCC 6/7/8
	force the alignment of m_val.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/profile-count.h