r256163 - in /trunk/gcc: ChangeLog alias.c

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Wed Jan  3 07:19:14 2018
New Revision: 256163

URL: https://gcc.gnu.org/viewcvs?rev=256163&root=gcc&view=rev
Log:
poly_int: memrefs_conflict_p

The xsize and ysize arguments to memrefs_conflict_p are encode such
that:

- 0 means the size is unknown
- >0 means the size is known
- <0 means that the negative of the size is a worst-case size after
  alignment

In other words, the sign effectively encodes a boolean; it isn't
meant to be taken literally.  With poly_ints these correspond to:

- must_eq (..., 0)
- may_gt (..., 0)
- may_lt (..., 0)

respectively.

2018-01-03  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* alias.c (addr_side_effect_eval): Take the size as a poly_int64
	rather than an int.  Use plus_constant.
	(memrefs_conflict_p): Take the sizes as poly_int64s rather than ints.
	Take the offset "c" as a poly_int64 rather than a HOST_WIDE_INT.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/alias.c