https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68537
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*
Component|tree-optimization |rtl-optimization
Version|unknown |6.0
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
We vectorize zeroing of protected_value and current_value which both are
analyzed as being properly aligned. They are of type
struct sym_val
{
const Elf64_Sym *s;
struct link_map *m;
};
which would have natural alignment of 8 bytes only. The actual decls look
like
arg 0 <var_decl 0x7ffff62d4e10 current_value
type <record_type 0x7ffff67b2690 sym_val sizes-gimplified type_0 TI
size <integer_cst 0x7ffff68cccf0 constant 128>
unit size <integer_cst 0x7ffff68ccd08 constant 16>
align 64 symtab 0 alias set 44 canonical type 0x7ffff67b2690 fields
<field_decl 0x7ffff6873098 s> context <translation_unit_decl 0x7ffff671dbb8
D.10151>
pointer_to_this <pointer_type 0x7ffff64dd5e8> chain <type_decl
0x7ffff6873000 D.9849>>
addressable used TI file dl-lookup.c line 810 col 18 size <integer_cst
0x7ffff68cccf0 128> unit size <integer_cst 0x7ffff68ccd08 16>
align 128 context <function_decl 0x7ffff6a968c0 _dl_lookup_symbol_x>
and thus indeed have a DECL_ALIGN of 16 bytes. expand_one_var computes align
as
else
align = MINIMUM_ALIGNMENT (var, DECL_MODE (var), DECL_ALIGN (var));
128 as well and registers that with the output machinery.
Partition 2: size 64 align 16
all protected_value all
Partition 1: size 16 align 16
current_value
Partition 0: size 8 align 8
old_hash
which looks ok as well.
Breakpoint 11, expand_one_stack_var_at (
decl=<var_decl 0x7ffff62ddc60 protected_value>, base=0x7ffff68cc3a8,
base_align=128, offset=-64)
at /space/rguenther/src/svn/trunk3/gcc/cfgexpand.c:978
978 gcc_assert (offset == trunc_int_for_mode (offset, Pmode));
Breakpoint 11, expand_one_stack_var_at (
decl=<var_decl 0x7ffff62d4e10 current_value>, base=0x7ffff68cc3a8,
base_align=128, offset=-80)
at /space/rguenther/src/svn/trunk3/gcc/cfgexpand.c:978
978 gcc_assert (offset == trunc_int_for_mode (offset, Pmode));
ok as well. So does the intitial RTL (well, still virtual-stack-vars is life).
So this is an RTL optimization or target issue.
