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vc4: Add support for emitting NIR IF nodes.

This commit is contained in:
Eric Anholt 2016-03-10 16:03:45 -08:00
parent f505f66cd5
commit 0adf2ec0ee
1 changed files with 91 additions and 1 deletions
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92
src/gallium/drivers/vc4/vc4_program.c
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@ -43,6 +43,8 @@
static struct qreg
ntq_get_src(struct vc4_compile *c, nir_src src, int i);
static void
ntq_emit_cf_list(struct vc4_compile *c, struct exec_list *list);
static void
resize_qreg_array(struct vc4_compile *c,
@ -1667,10 +1669,98 @@ ntq_emit_intrinsic(struct vc4_compile *c, nir_intrinsic_instr *instr)
}
}
/* Clears (activates) the execute flags for any channels whose jump target
* matches this block.
*/
static void
ntq_activate_execute_for_block(struct vc4_compile *c)
{
qir_SF(c, qir_SUB(c,
c->execute,
qir_uniform_ui(c, c->cur_block->index)));
qir_MOV_cond(c, QPU_COND_ZS, c->execute, qir_uniform_ui(c, 0));
}
static void
ntq_emit_if(struct vc4_compile *c, nir_if *if_stmt)
{
fprintf(stderr, "general IF statements not handled.\n");
if (!c->vc4->screen->has_control_flow) {
fprintf(stderr,
"IF statement support requires updated kernel.\n");
return;
}
nir_cf_node *nir_first_else_node = nir_if_first_else_node(if_stmt);
nir_cf_node *nir_last_else_node = nir_if_last_else_node(if_stmt);
nir_block *nir_else_block = nir_cf_node_as_block(nir_first_else_node);
bool empty_else_block =
(nir_first_else_node == nir_last_else_node &&
exec_list_is_empty(&nir_else_block->instr_list));
struct qblock *then_block = qir_new_block(c);
struct qblock *after_block = qir_new_block(c);
struct qblock *else_block;
if (empty_else_block)
else_block = after_block;
else
else_block = qir_new_block(c);
bool was_top_level = false;
if (c->execute.file == QFILE_NULL) {
c->execute = qir_MOV(c, qir_uniform_ui(c, 0));
was_top_level = true;
}
/* Set ZS for executing (execute == 0) and jumping (if->condition ==
* 0) channels, and then update execute flags for those to point to
* the ELSE block.
*/
qir_SF(c, qir_OR(c,
c->execute,
ntq_get_src(c, if_stmt->condition, 0)));
qir_MOV_cond(c, QPU_COND_ZS, c->execute,
qir_uniform_ui(c, else_block->index));
/* Jump to ELSE if nothing is active for THEN, otherwise fall
* through.
*/
qir_SF(c, c->execute);
qir_BRANCH(c, QPU_COND_BRANCH_ALL_ZC);
qir_link_blocks(c->cur_block, else_block);
qir_link_blocks(c->cur_block, then_block);
/* Process the THEN block. */
qir_set_emit_block(c, then_block);
ntq_emit_cf_list(c, &if_stmt->then_list);
if (!empty_else_block) {
/* Handle the end of the THEN block. First, all currently
* active channels update their execute flags to point to
* ENDIF
*/
qir_SF(c, c->execute);
qir_MOV_cond(c, QPU_COND_ZS, c->execute,
qir_uniform_ui(c, after_block->index));
/* If everything points at ENDIF, then jump there immediately. */
qir_SF(c, qir_SUB(c, c->execute, qir_uniform_ui(c, after_block->index)));
qir_BRANCH(c, QPU_COND_BRANCH_ALL_ZS);
qir_link_blocks(c->cur_block, after_block);
qir_link_blocks(c->cur_block, else_block);
qir_set_emit_block(c, else_block);
ntq_activate_execute_for_block(c);
ntq_emit_cf_list(c, &if_stmt->else_list);
}
qir_link_blocks(c->cur_block, after_block);
qir_set_emit_block(c, after_block);
if (was_top_level)
c->execute = c->undef;
else
ntq_activate_execute_for_block(c);
}
static void