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ir_copy_propagation: Return true if we optimized out any assignments.

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This may trigger other optimization phases to make more progress themselves.
This commit is contained in:
Eric Anholt
2010-05-05 09:31:53 -07:00
parent 4e2c0b99d9
commit 8e75de3164
3 changed files with 25 additions and 16 deletions
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ir_basic_block.cpp
+12 -10
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@@ -61,7 +61,9 @@ has_call_callback(ir_instruction *ir, void *data)
*/
void call_for_basic_blocks(exec_list *instructions,
void (*callback)(ir_instruction *first,
ir_instruction *last))
ir_instruction *last,
void *data),
void *data)
{
ir_instruction *leader = NULL;
ir_instruction *last = NULL;
@@ -76,17 +78,17 @@ void call_for_basic_blocks(exec_list *instructions,
leader = ir;
if ((ir_if = ir->as_if())) {
callback(leader, ir);
callback(leader, ir, data);
leader = NULL;
call_for_basic_blocks(&ir_if->then_instructions, callback);
call_for_basic_blocks(&ir_if->else_instructions, callback);
call_for_basic_blocks(&ir_if->then_instructions, callback, data);
call_for_basic_blocks(&ir_if->else_instructions, callback, data);
} else if ((ir_loop = ir->as_loop())) {
callback(leader, ir);
callback(leader, ir, data);
leader = NULL;
call_for_basic_blocks(&ir_loop->body_instructions, callback);
call_for_basic_blocks(&ir_loop->body_instructions, callback, data);
} else if (ir->as_return() || ir->as_call()) {
callback(leader, ir);
callback(leader, ir, data);
leader = NULL;
} else if ((ir_function = ir->as_function())) {
/* A function definition doesn't interrupt our basic block
@@ -103,7 +105,7 @@ void call_for_basic_blocks(exec_list *instructions,
ir_sig = (ir_function_signature *)fun_iter.get();
call_for_basic_blocks(&ir_sig->body, callback);
call_for_basic_blocks(&ir_sig->body, callback, data);
}
} else if (ir->as_assignment()) {
bool has_call = false;
@@ -124,13 +126,13 @@ void call_for_basic_blocks(exec_list *instructions,
ir_visit_tree(ir, has_call_callback, &has_call);
if (has_call) {
callback(leader, ir);
callback(leader, ir, data);
leader = NULL;
}
}
last = ir;
}
if (leader) {
callback(leader, last);
callback(leader, last, data);
}
}