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i965/cfg: Remove if_block/else_block.

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I used these in the SEL peephole, but they require extra tracking and
fix ups. The SEL peephole can pretty easily find the blocks it needs
without these.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Matt Turner 2014-11-10 22:04:41 -08:00
parent 4001181ba3
commit 7a82961b71
3 changed files with 1 additions and 30 deletions
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15
src/mesa/drivers/dri/i965/brw_cfg.cpp
View file

@ -51,8 +51,7 @@ link(void *mem_ctx, bblock_t *block)
}
bblock_t::bblock_t(cfg_t *cfg) :
cfg(cfg), start_ip(0), end_ip(0), num(0),
if_block(NULL), else_block(NULL)
cfg(cfg), start_ip(0), end_ip(0), num(0)
{
instructions.make_empty();
parents.make_empty();
@ -136,7 +135,6 @@ bblock_t::combine_with(bblock_t *that)
}
this->end_ip = that->end_ip;
this->else_block = that->else_block;
this->instructions.append_list(&that->instructions);
this->cfg->remove_block(that);
@ -238,17 +236,6 @@ cfg_t::cfg_t(exec_list *instructions)
assert(cur_if->end()->opcode == BRW_OPCODE_IF);
assert(!cur_else || cur_else->end()->opcode == BRW_OPCODE_ELSE);
cur_if->if_block = cur_if;
cur_if->else_block = cur_else;
if (cur_else) {
cur_else->if_block = cur_if;
cur_else->else_block = cur_else;
}
cur->if_block = cur_if;
cur->else_block = cur_else;
/* Pop the stack so we're in the previous if/else/endif */
cur_if = pop_stack(&if_stack);
cur_else = pop_stack(&else_stack);

8
src/mesa/drivers/dri/i965/brw_cfg.h
View file

@ -89,14 +89,6 @@ struct bblock_t {
struct exec_list parents;
struct exec_list children;
int num;
/* If the current basic block ends in an IF or ELSE instruction, these will
* point to the basic blocks containing the other associated instruction.
*
* Otherwise they are NULL.
*/
struct bblock_t *if_block;
struct bblock_t *else_block;
};
static inline struct backend_instruction *

8
src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp
View file

@ -85,7 +85,6 @@ dead_control_flow_eliminate(backend_visitor *v)
}
if (else_inst) {
else_block->if_block->else_block = NULL;
else_inst->remove(else_block);
}
@ -102,13 +101,6 @@ dead_control_flow_eliminate(backend_visitor *v)
if (earlier_block && earlier_block->can_combine_with(later_block)) {
earlier_block->combine_with(later_block);
foreach_block (block, v->cfg) {
if (block->if_block == later_block)
block->if_block = earlier_block;
if (block->else_block == later_block)
block->else_block = earlier_block;
}
/* If ENDIF was in its own block, then we've now deleted it and
* merged the two surrounding blocks, the latter of which the
* __next block pointer was pointing to.