Hello, I noticed that the restrict doesn't work fully on 4.4.0 (used to work on our port based on 4.3 branch). The problem is that tree optimizer can do a lot of optimization regarding pointer, e.g., at -O3. The alias set property is not propagated accordingly.
Is the following RTL expansion correct? Both read and write address are converted to a restrict pointer, but the both mem rtx have the same alias set (2). ;; *(int * restrict) (D.1768 + 4) = *(int * restrict) (D.1770 + 4); (insn 56 55 57 tst.c:7 (set (reg:SI 124) (mem:SI (plus:SI (reg:SI 103 [ D.1770 ]) (const_int 4 [0x4])) [2 S4 A32])) -1 (nil)) (insn 57 56 0 tst.c:7 (set (mem:SI (plus:SI (reg:SI 104 [ D.1768 ]) (const_int 4 [0x4])) [2 S4 A32]) (reg:SI 124)) -1 (nil)) The alias set property is copied from tree node: <indirect_ref 0xf7f09d40 type <integer_type 0xf7f122f4 int sizes-gimplified public SI size <integer_cst 0xf7f0f9d8 constant 32> unit size <integer_cst 0xf7f0f7c4 constant 4> align 32 symtab 0 alias set 2 canonical type 0xf7f122f4 precision 32 min <integer_cst 0xf7f0f984 -2147483648> max <integer_cst 0xf7f0f9a0 2147483647> pointer_to_this <pointer_type 0xf7f18798>> arg 0 <nop_expr 0xf7fc7400 type <pointer_type 0xf7fa6870 type <integer_type 0xf7f122f4 int> sizes-gimplified public unsigned restrict SI size <integer_cst 0xf7f0f9d8 32> unit size <integer_cst 0xf7f0f7c4 4> align 32 symtab 0 alias set -1 canonical type 0xf7fa6870> arg 0 <plus_expr 0xf7fc95e8 type <integer_type 0xf7f12438 long unsigned int> arg 0 <var_decl 0xf7fc4a6c D.1768> arg 1 <integer_cst 0xf7fb7bec constant 4> tst.c:7:5> tst.c:7:5> tst.c:7:5> Is the RTL expansion wrong or the orginal tree node is constructed incorrectly? Thanks, Bingfeng Mei Broadcom UK