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glsl: Clean up code by adding a new is_break() function.

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This commit is contained in:
Kenneth Graunke 2010-12-01 15:06:47 -08:00 • committed by Ian Romanick
parent b13a2e640f
commit 528fa8ce32
1 changed files with 11 additions and 6 deletions
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17
src/glsl/loop_unroll.cpp
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@ -43,6 +43,14 @@ public:
};
static bool
is_break(ir_instruction *ir)
{
return ir != NULL && ir->ir_type == ir_type_loop_jump
&& ((ir_loop_jump *) ir)->is_break();
}
ir_visitor_status
loop_unroll_visitor::visit_leave(ir_loop *ir)
{
@ -93,14 +101,12 @@ loop_unroll_visitor::visit_leave(ir_loop *ir)
ir_instruction *last =
(ir_instruction *) last_if->then_instructions.get_tail();
if (last && last->ir_type == ir_type_loop_jump
&& ((ir_loop_jump*) last)->is_break()) {
if (is_break(last)) {
continue_from_then_branch = false;
} else {
last = (ir_instruction *) last_if->then_instructions.get_tail();
if (last && last->ir_type == ir_type_loop_jump
&& ((ir_loop_jump*) last)->is_break())
if (is_break(last))
continue_from_then_branch = true;
else
/* Bail out if neither if-statement branch ends with a break.
@ -141,8 +147,7 @@ loop_unroll_visitor::visit_leave(ir_loop *ir)
this->progress = true;
return visit_continue;
} else if (last_ir->ir_type == ir_type_loop_jump
&& ((ir_loop_jump *)last_ir)->is_break()) {
} else if (is_break(last_ir)) {
/* If the only loop-jump is a break at the end of the loop, the loop
* will execute exactly once. Remove the break, set the iteration
* count, and fall through to the normal unroller.