r242214 - /branches/ARM/sve-branch/gcc/tree-ssa...

[rsandifo at gcc dot gnu dot org]

Author: rsandifo
Date: Fri Nov 11 17:20:00 2016
New Revision: 242214

URL: https://gcc.gnu.org/viewcvs?rev=242214&root=gcc&view=rev
Log:
Tighten tree-ssa-ccp.c:get_value_for_expr condition

bit_value_unop and bit_value_binop require constant values
to be INTEGER_CSTs:

  gcc_assert ((rval.lattice_val == CONSTANT
               && TREE_CODE (rval.value) == INTEGER_CST)
              || wi::sext (rval.mask, TYPE_PRECISION (TREE_TYPE (rhs))) == -1);

However, when deciding whether to record a constant value,
the for_bits_p handling in get_value_for_expr used a negative
test for ADDR_EXPR:

  else if (is_gimple_min_invariant (expr)
           && (!for_bits_p || TREE_CODE (expr) != ADDR_EXPR))

This patch uses a positive test for INTEGER_CST instead.

Existing tests showed the need for this once polynomial
constants are added.

Modified:
    branches/ARM/sve-branch/gcc/tree-ssa-ccp.c