static void sparc_sp_sim(ir_node *const node, stack_pointer_state_t *state)
{
sparc_determine_frameoffset(node, state->offset);
if (is_sparc_Save(node)) {
sparc_attr_t *const attr = get_sparc_attr(node);
if (get_irn_arity(node) == 3)
panic("no support for _reg variant yet");
/* Adjust for alignment */
assert(state->misalign == 0);
int const prev_offset = state->offset;
int const new_offset = prev_offset - state->align_padding
- attr->immediate_value;
int const aligned = round_up2(new_offset, 1u << state->p2align);
attr->immediate_value = -(aligned - prev_offset);
state->align_padding = aligned - new_offset;
state->offset = aligned;
} else if (is_sparc_SubSP(node) || is_sparc_AddSP(node)) {
state->align_padding = 0;
} else if (is_sparc_RestoreZero(node)) {
state->offset = 0;
state->align_padding = 0;
}
}
static void process_bias(ir_node *block, bool omit_fp, int bias, int free_bytes)
{
mark_Block_block_visited(block);
/* process schedule */
sched_foreach(block, irn) {
/* set bias to nodes with entities */
ir_entity *entity = sparc_get_frame_entity(irn);
if (entity != NULL) {
int offset = get_entity_offset(entity);
if (omit_fp)
offset += bias + SPARC_MIN_STACKSIZE;
sparc_set_frame_offset(irn, offset);
}
/* The additional alignment bytes cannot be used
* anymore after alloca. */
if (is_sparc_SubSP(irn)) {
free_bytes = 0;
} else if (is_sparc_AddSP(irn)) {
assert(free_bytes == 0);
}
int irn_bias = sparc_get_sp_bias(irn);
if (irn_bias == 0) {
/* do nothing */
} else if (irn_bias == SP_BIAS_RESET) {
bias = 0;
} else {
/* adjust values to respect stack alignment */
irn_bias -= free_bytes;
int new_bias_unaligned = bias + irn_bias;
int new_bias_aligned
= round_up2(new_bias_unaligned, SPARC_STACK_ALIGNMENT);
free_bytes = new_bias_aligned - new_bias_unaligned;
set_irn_sp_bias(irn, new_bias_aligned - bias);
bias = new_bias_aligned;
}
}