rely on having this alignment.  */
#define PREFERRED_STACK_BOUNDARY ix86_preferred_stack_boundary

/* It should be MIN_STACK_BOUNDARY.  But we set it to 128 bits for
   both 32bit and 64bit, to support codes that need 128 bit stack
   alignment for SSE instructions, but can't realign the stack.  */
#define PREFERRED_STACK_BOUNDARY_DEFAULT \
  (TARGET_IAMCU ? MIN_STACK_BOUNDARY : 128)

/* 1 if -mstackrealign should be turned on by default.  It will
   generate an alternate prologue and epilogue that realigns the
   runtime stack if nessary.  This supports mixing codes that keep a
   4-byte aligned stack, as specified by i386 psABI, with codes that
   need a 16-byte aligned stack, as required by SSE instructions.  */
#define STACK_REALIGN_DEFAULT 0

/* Boundary (in *bits*) on which the incoming stack is aligned.  */
#define INCOMING_STACK_BOUNDARY ix86_incoming_stack_boundary

/* According to Windows x64 software convention, the maximum stack allocatable
   in the prologue is 4G - 8 bytes.  Furthermore, there is a limited set of
   instructions allowed to adjust the stack pointer in the epilog, forcing the
   use of frame pointer for frames larger than 2 GB.  This theorical limit
   is reduced by 256, an over-estimated upper bound for the stack use by the
   prologue.
   We define only one threshold for both the prolog and the epilog.  When the
   frame size is larger than this threshold, we allocate the area to save SSE
   regs, then save them, and then allocate the remaining.  There is no SEH
   unwind info for this later allocation.  */
#define SEH_MAX_FRAME_SIZE ((2U << 30) - 256)

/* Target OS keeps a vector-aligned (128-bit, 16-byte) stack.  This is
   mandatory for the 64-bit ABI, and may or may not be true for other
   operating systems.  */
#define TARGET_KEEPS_VECTOR_ALIGNED_STACK TARGET_64BIT

/* Minimum allocation boundary for the code of a function.  */
#define FUNCTION_BOUNDARY 8

/* C++ stores the virtual bit in the lowest bit of function pointers.  */
#define TARGET_PTRMEMFUNC_VBIT_LOCATION ptrmemfunc_vbit_in_pfn

/* Minimum size in bits of the largest boundary to which any
   and all fundamental data types supported by the hardware
   might need to be aligned. No data type wants to be aligned
   rounder than this.

   Pentium+ prefers DFmode values to be aligned to 64 bit boundary
   and Pentium Pro XFmode values at 128 bit boundaries.

   When increasing the maximum, also update
   TARGET_ABSOLUTE_BIGGEST_ALIGNMENT.  */

#define BIGGEST_ALIGNMENT \
  (TARGET_IAMCU ? 32 : (TARGET_AVX512F ? 512 : (TARGET_AVX ? 256 : 128)))

/* Maximum stack alignment.  */
#define MAX_STACK_ALIGNMENT MAX_OFILE_ALIGNMENT

/* Alignment value for attribute ((aligned)).  It is a constant since
   it is the part of the ABI.  We shouldn't change it with -mavx.  */
#define ATTRIBUTE_ALIGNED_VALUE (TARGET_IAMCU ? 32 : 128)

/* Decide whether a variable of mode MODE should be 128 bit aligned.  */
#define ALIGN_MODE_128(MODE) \
 ((MODE) == XFmode || SSE_REG_MODE_P (MODE))

/* The published ABIs say that doubles should be aligned on word
   boundaries, so lower the alignment for structure fields unless
   -malign-double is set.  */

/* ??? Blah -- this macro is used directly by libobjc.  Since it
   supports no vector modes, cut out the complexity and fall back
   on BIGGEST_FIELD_ALIGNMENT.  */
#ifdef IN_TARGET_LIBS
#ifdef __x86_64__
#define BIGGEST_FIELD_ALIGNMENT 128
#else
#define BIGGEST_FIELD_ALIGNMENT 32
#endif
#else
#define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
  x86_field_alignment ((TYPE), (COMPUTED))
#endif

/* If defined, a C expression to compute the alignment for a static
   variable.  TYPE is the data type, and ALIGN is the alignment that
   the object would ordinarily have.  The value of this macro is used
   instead of that alignment to align the object.

   If this macro is not defined, then ALIGN is used.

   One use of this macro is to increase alignment of medium-size
   data to make it all fit in fewer cache lines.  Another is to
   cause character arrays to be word-aligned so that `strcpy' calls
   that copy constants to character arrays can be done inline.  */

#define DATA_ALIGNMENT(TYPE, ALIGN) \
  ix86_data_alignment ((TYPE), (ALIGN), true)

/* Similar to DATA_ALIGNMENT, but for the cases where the ABI mandates
   some alignment increase, instead of optimization only purposes.  E.g.
   AMD x86-64 psABI says that variables with array type larger than 15 bytes
   must be aligned to 16 byte boundaries.

   If this macro is not defined, then ALIGN is used.  */

#define DATA_ABI_ALIGNMENT(TYPE, ALIGN) \
  ix86_data_alignment ((TYPE), (ALIGN), false)

/* If defined, a C expression to compute the alignment for a local
   variable.  TYPE is the data type, and ALIGN is the alignment that
   the object would ordinarily have.  The value of this macro is used
   instead of that alignment to align the object.

   If this macro is not defined, then ALIGN is used.

   One use of this macro is to increase alignment of medium-size
   data to make it all fit in fewer cache lines.  */

#define LOCAL_ALIGNMENT(TYPE, ALIGN) \
  ix86_local_alignment ((TYPE), VOIDmode, (ALIGN))

/* If defined, a C expression to compute the alignment for stack slot.
   TYPE is the data type, MODE is the widest mode available, and ALIGN
   is the alignment that the slot would ordinarily have.  The value of
   this macro is used instead of that alignment to align the slot.

   If this macro is not defined, then ALIGN is used when TYPE is NULL,
   Otherwise, LOCAL_ALIGNMENT will be used.

   One use of this macro is to set alignment of stack slot to the
   maximum alignment of all possible modes which the slot may have.  */

#define STACK_SLOT_ALIGNMENT(TYPE, MODE, ALIGN) \
  ix86_local_alignment ((TYPE), (MODE), (ALIGN))

/* If defined, a C expression to compute the alignment for a local
   variable DECL.

   If this macro is not defined, then
   LOCAL_ALIGNMENT (TREE_TYPE (DECL), DECL_ALIGN (DECL)) will be used.

   One use of this macro is to increase alignment of medium-size
   data to make it all fit in fewer cache lines.  */

#define LOCAL_DECL_ALIGNMENT(DECL) \
  ix86_local_alignment ((DECL), VOIDmode, DECL_ALIGN (DECL))

/* If defined, a C expression to compute the minimum required alignment
   for dynamic stack realignment purposes for EXP (a TYPE or DECL),
   MODE, assuming normal alignment ALIGN.

   If this macro is not defined, then (ALIGN) will be used.  */

#define MINIMUM_ALIGNMENT(EXP, MODE, ALIGN) \
  ix86_minimum_alignment ((EXP), (MODE), (ALIGN))


/* Set this nonzero if move instructions will actually fail to work
   when given unaligned data.  */
#define STRICT_ALIGNMENT 0

/* If bit field type is int, don't let it cross an int,
   and give entire struct the alignment of an int.  */
/* Required on the 386 since it doesn't have bit-field insns.  */
#define PCC_BITFIELD_TYPE_MATTERS 1