MatCat.OpenSource/8sa1-gcc
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

(allocate_dynamic_stack_space): Test STACK_BOUNDARY against BIGGEST_ALIGNMENT at run time instead of at compile time.

Browse Source 
(allocate_dynamic_stack_space): Test STACK_BOUNDARY against
BIGGEST_ALIGNMENT at run time instead of at compile time.  Give
MUST_ALIGN macro a value, and test this value in if statements.

From-SVN: r9263
This commit is contained in:
Jim Wilson 1995-03-30 15:14:37 -08:00
parent 4084f7897a
commit 515a7242ff
1 changed files with 8 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
gcc/explow.c
View File

@ -949,24 +949,13 @@ allocate_dynamic_stack_space (size, target, known_align)
If we have to align, we must leave space in SIZE for the hole
that might result from the alignment operation. */
#if defined (STACK_DYNAMIC_OFFSET) || defined(STACK_POINTER_OFFSET) || defined (ALLOCATE_OUTGOING_ARGS)
#define MUST_ALIGN
#if defined (STACK_DYNAMIC_OFFSET) || defined (STACK_POINTER_OFFSET) || defined (ALLOCATE_OUTGOING_ARGS) || ! defined (STACK_BOUNDARY)
#define MUST_ALIGN 1
#else
#define MUST_ALIGN (STACK_BOUNDARY < BIGGEST_ALIGNMENT)
#endif
#if ! defined (MUST_ALIGN) && (!defined(STACK_BOUNDARY) || STACK_BOUNDARY < BIGGEST_ALIGNMENT)
#define MUST_ALIGN
#endif
#ifdef MUST_ALIGN
#if 0 /* It turns out we must always make extra space, if MUST_ALIGN
because we must always round the address up at the end,
because we don't know whether the dynamic offset
will mess up the desired alignment. */
/* If we have to round the address up regardless of known_align,
make extra space regardless, also. */
if (known_align % BIGGEST_ALIGNMENT != 0)
#endif
if (MUST_ALIGN)
{
if (GET_CODE (size) == CONST_INT)
size = GEN_INT (INTVAL (size)
@ -977,8 +966,6 @@ allocate_dynamic_stack_space (size, target, known_align)
NULL_RTX, 1, OPTAB_LIB_WIDEN);
}
#endif
#ifdef SETJMP_VIA_SAVE_AREA
/* If setjmp restores regs from a save area in the stack frame,
avoid clobbering the reg save area. Note that the offset of
@ -1011,8 +998,8 @@ allocate_dynamic_stack_space (size, target, known_align)
#ifdef STACK_BOUNDARY
/* If we added a variable amount to SIZE,
we can no longer assume it is aligned. */
#if !defined (SETJMP_VIA_SAVE_AREA) && !defined (MUST_ALIGN)
if (known_align % STACK_BOUNDARY != 0)
#if !defined (SETJMP_VIA_SAVE_AREA)
if (! MUST_ALIGN && known_align % STACK_BOUNDARY != 0)
#endif
size = round_push (size);
#endif
@ -1054,12 +1041,7 @@ allocate_dynamic_stack_space (size, target, known_align)
emit_move_insn (target, virtual_stack_dynamic_rtx);
#endif
#ifdef MUST_ALIGN
#if 0 /* Even if we know the stack pointer has enough alignment,
there's no way to tell whether virtual_stack_dynamic_rtx shares that
alignment, so we still need to round the address up. */
if (known_align % BIGGEST_ALIGNMENT != 0)
#endif
if (MUST_ALIGN)
{
/* CEIL_DIV_EXPR needs to worry about the addition overflowing,
but we know it can't. So add ourselves and then do TRUNC_DIV_EXPR. */
@ -1073,7 +1055,6 @@ allocate_dynamic_stack_space (size, target, known_align)
GEN_INT (BIGGEST_ALIGNMENT / BITS_PER_UNIT),
NULL_RTX, 1);
}
#endif
/* Some systems require a particular insn to refer to the stack
to make the pages exist. */