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function.c (assign_temp): Change zero-sized arrays to size 1.

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* function.c (assign_temp): Change zero-sized arrays to size 1.
	* integrate.c (expand_inline_function): Do not update
	stack_alignment_needed
	* i386.c (compute_frame_size): Remove #ifdef PREFERRED_FRAME_BOUNDARY,
	add some sanity checking, remove optimization for function with
	zero frame size.

From-SVN: r31898
This commit is contained in:
Jan Hubicka 2000-02-10 18:43:55 +01:00 committed by Jan Hubicka
parent 715bdd8117
commit 44affdae26
4 changed files with 40 additions and 30 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
Thu Feb 10 18:28:59 MET 2000 Jan Hubicka <jh@suse.cz>
* function.c (assign_temp): Change zero-sized arrays to size 1.
* integrate.c (expand_inline_function): Do not update
stack_alignment_needed
* i386.c (compute_frame_size): Remove #ifdef PREFERRED_FRAME_BOUNDARY,
add some sanity checking, remove optimization for function with
zero frame size.
2000-02-10 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* flow.c (mark_regs_live_at_end): Delete unused variables.

53
gcc/config/i386/i386.c
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@ -1769,44 +1769,43 @@ ix86_compute_frame_size (size, nregs_on_stack, rpadding1, rpadding2)
int padding2 = 0;
HOST_WIDE_INT total_size;
int stack_alignment_needed = cfun->stack_alignment_needed / BITS_PER_UNIT;
int offset;
int preferred_alignment = cfun->preferred_stack_boundary / BITS_PER_UNIT;
nregs = ix86_nsaved_regs ();
total_size = size;
#ifdef PREFERRED_STACK_BOUNDARY
{
int offset;
int preferred_alignment = cfun->preferred_stack_boundary / BITS_PER_UNIT;
offset = frame_pointer_needed ? 8 : 4;
offset = frame_pointer_needed ? 8 : 4;
/* Do some sanity checking of stack_alignment_needed and preferred_alignment,
since i386 port is the only using those features that may break easilly. */
/* When frame is not empty we ought to have recorded the alignment. */
if (size && !stack_alignment_needed)
abort ();
if (size && !stack_alignment_needed)
abort ();
if (!size && stack_alignment_needed)
abort ();
if (preferred_alignment < STACK_BOUNDARY / BITS_PER_UNIT)
abort ();
if (preferred_alignment > PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT)
abort ();
if (stack_alignment_needed > PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT)
abort ();
if (stack_alignment_needed < 4)
stack_alignment_needed = 4;
if (stack_alignment_needed < 4)
stack_alignment_needed = 4;
if (stack_alignment_needed > PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT)
abort ();
offset += nregs * UNITS_PER_WORD;
offset += nregs * UNITS_PER_WORD;
total_size += offset;
total_size += offset;
/* Align start of frame for local function. */
padding1 = ((offset + stack_alignment_needed - 1)
& -stack_alignment_needed) - offset;
total_size += padding1;
/* Align start of frame for local function. */
if (size > 0)
{
padding1 = ((offset + stack_alignment_needed - 1)
& -stack_alignment_needed) - offset;
total_size += padding1;
}
/* Align stack boundary. */
padding2 = ((total_size + preferred_alignment - 1)
& -preferred_alignment) - total_size;
}
#endif
/* Align stack boundary. */
padding2 = ((total_size + preferred_alignment - 1)
& -preferred_alignment) - total_size;
if (nregs_on_stack)
*nregs_on_stack = nregs;

5
gcc/function.c
View File

@ -837,6 +837,11 @@ assign_temp (type, keep, memory_required, dont_promote)
HOST_WIDE_INT size = int_size_in_bytes (type);
rtx tmp;
/* Zero sized arrays are GNU C extension. Set size to 1 to avoid
problems with allocating the stack space. */
if (size == 0)
size = 1;
/* Unfortunately, we don't yet know how to allocate variable-sized
temporaries. However, sometimes we have a fixed upper limit on
the size (which is stored in TYPE_ARRAY_MAX_SIZE) and can use that

3
gcc/integrate.c
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@ -605,9 +605,6 @@ expand_inline_function (fndecl, parms, target, ignore, type,
if (cfun->preferred_stack_boundary < inl_f->preferred_stack_boundary)
cfun->preferred_stack_boundary = inl_f->preferred_stack_boundary;
if (cfun->stack_alignment_needed < inl_f->stack_alignment_needed)
cfun->stack_alignment_needed = inl_f->stack_alignment_needed;
/* Check that the parms type match and that sufficient arguments were
passed. Since the appropriate conversions or default promotions have
already been applied, the machine modes should match exactly. */