1 Index: gcc/hooks.c
   2 ===================================================================
   3 *** gcc/hooks.c	(revision 202709)
   4 --- gcc/hooks.c	(working copy)
   5 *************** hook_rtx_tree_int_null (tree a ATTRIBUTE
   6 *** 352,357 ****
   7 --- 352,364 ----
   8     return NULL;
   9   }
  10   
  11 + /* Generic hook that takes a machine mode and returns an unsigned int 0.  */
  12 + unsigned int
  13 + hook_uint_mode_0 (enum machine_mode m ATTRIBUTE_UNUSED)
  14 + {
  15 +   return 0;
  16 + }
  17 + 
  18   /* Generic hook that takes three trees and returns the last one as is.  */
  19   tree
  20   hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
  21 Index: gcc/hooks.h
  22 ===================================================================
  23 *** gcc/hooks.h	(revision 202709)
  24 --- gcc/hooks.h	(working copy)
  25 *************** extern tree hook_tree_tree_tree_tree_3rd
  26 *** 89,94 ****
  27 --- 89,95 ----
  28   extern tree hook_tree_tree_int_treep_bool_null (tree, int, tree *, bool);
  29   
  30   extern unsigned hook_uint_void_0 (void);
  31 + extern unsigned int hook_uint_mode_0 (enum machine_mode);
  32   
  33   extern bool default_can_output_mi_thunk_no_vcall (const_tree, HOST_WIDE_INT,
  34   						  HOST_WIDE_INT, const_tree);
  35 Index: gcc/target.def
  36 ===================================================================
  37 *** gcc/target.def	(revision 202709)
  38 --- gcc/target.def	(working copy)
  39 *************** DEFHOOKPOD
  40 *** 5123,5129 ****
  41    @code{atomic_test_and_set} is not exactly 1, i.e. the\
  42    @code{bool} @code{true}.",
  43    unsigned char, 1)
  44 !  
  45   /* Leave the boolean fields at the end.  */
  46   
  47   /* True if we can create zeroed data by switching to a BSS section
  48 --- 5123,5141 ----
  49    @code{atomic_test_and_set} is not exactly 1, i.e. the\
  50    @code{bool} @code{true}.",
  51    unsigned char, 1)
  52 ! 
  53 ! /* Return an unsigned int representing the alignment (in bits) of the atomic
  54 !    type which maps to machine MODE.  This allows alignment to be overridden
  55 !    as needed.  */
  56 ! DEFHOOK
  57 ! (atomic_align_for_mode,
  58 ! "If defined, this function returns an appropriate alignment in bits for an\
  59 !  atomic object of machine_mode @var{mode}.  If 0 is returned then the\
  60 !  default alignment for the specified mode is used. ",
  61 !  unsigned int, (enum machine_mode mode),
  62 !  hook_uint_mode_0)
  63 ! 
  64 ! 
  65   /* Leave the boolean fields at the end.  */
  66   
  67   /* True if we can create zeroed data by switching to a BSS section
  68 Index: gcc/doc/tm.texi
  69 ===================================================================
  70 *** gcc/doc/tm.texi	(revision 202709)
  71 --- gcc/doc/tm.texi	(working copy)
  72 *************** It returns true if the target supports G
  73 *** 11353,11355 ****
  74 --- 11353,11359 ----
  75   The support includes the assembler, linker and dynamic linker.
  76   The default value of this hook is based on target's libc.
  77   @end deftypefn
  78 + 
  79 + @deftypefn {Target Hook} {unsigned int} TARGET_ATOMIC_ALIGN_FOR_MODE (enum machine_mode @var{mode})
  80 + If defined, this function returns an appropriate alignment in bits for an atomic object of machine_mode @var{mode}.  If 0 is returned then the default alignment for the specified mode is used. 
  81 + @end deftypefn
  82 Index: gcc/doc/tm.texi.in
  83 ===================================================================
  84 *** gcc/doc/tm.texi.in	(revision 202709)
  85 --- gcc/doc/tm.texi.in	(working copy)
  86 *************** and the associated definitions of those
  87 *** 8388,8390 ****
  88 --- 8388,8392 ----
  89   @hook TARGET_ATOMIC_TEST_AND_SET_TRUEVAL
  90   
  91   @hook TARGET_HAS_IFUNC_P
  92 + 
  93 + @hook TARGET_ATOMIC_ALIGN_FOR_MODE
  94