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-rw-r--r--src/mesa/drivers/dri/i965/brw_shader.cpp46
-rw-r--r--src/mesa/drivers/dri/i965/brw_shader.h4
2 files changed, 50 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index 28db29ac076..464790af9dd 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -732,6 +732,52 @@ backend_instruction::has_side_effects() const
}
}
+#ifndef NDEBUG
+static bool
+inst_is_in_block(const bblock_t *block, const backend_instruction *inst)
+{
+ bool found = false;
+ foreach_inst_in_block (backend_instruction, i, block) {
+ if (inst == i) {
+ found = true;
+ }
+ }
+ return found;
+}
+#endif
+
+static void
+adjust_later_block_ips(bblock_t *start_block, int ip_adjustment)
+{
+ for (bblock_t *block_iter = (bblock_t *)start_block->link.next;
+ !block_iter->link.is_tail_sentinel();
+ block_iter = (bblock_t *)block_iter->link.next) {
+ block_iter->start_ip += ip_adjustment;
+ block_iter->end_ip += ip_adjustment;
+ }
+}
+
+void
+backend_instruction::remove(bblock_t *block)
+{
+ assert(inst_is_in_block(block, this) || !"Instruction not in block");
+
+ adjust_later_block_ips(block, -1);
+
+ if (block->start_ip == block->end_ip) {
+ block->cfg->remove_block(block);
+ } else {
+ block->end_ip--;
+
+ if (block->start == this)
+ block->start = (backend_instruction *)this->next;
+ if (block->end == this)
+ block->end = (backend_instruction *)this->prev;
+ }
+
+ exec_node::remove();
+}
+
void
backend_visitor::dump_instructions()
{
diff --git a/src/mesa/drivers/dri/i965/brw_shader.h b/src/mesa/drivers/dri/i965/brw_shader.h
index 5980cf0cd68..f5af4fd44e1 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.h
+++ b/src/mesa/drivers/dri/i965/brw_shader.h
@@ -78,6 +78,7 @@ struct backend_reg
};
struct cfg_t;
+struct bblock_t;
#ifdef __cplusplus
struct backend_instruction : public exec_node {
@@ -89,6 +90,9 @@ struct backend_instruction : public exec_node {
bool reads_accumulator_implicitly() const;
bool writes_accumulator_implicitly(struct brw_context *brw) const;
+ using exec_node::remove;
+ void remove(bblock_t *block);
+
/**
* True if the instruction has side effects other than writing to
* its destination registers. You are expected not to reorder or