With multiple ranges per interval it is expensive to calculate
interval intersection. We do not have to check intersection between
current and intervals which have incompatible register type. That's
because this information will not be used after all. pick_register()
will not consider those registers. For example, we do not have to
check at which position XMM0 register is available if we are
allocating a general purpose register.
Signed-off-by: Tomek Grabiec <tgrab...@gmail.com>
---
jit/linear-scan.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/jit/linear-scan.c b/jit/linear-scan.c
index 187eb49..c824104 100644
--- a/jit/linear-scan.c
+++ b/jit/linear-scan.c
@@ -210,6 +210,9 @@ static void allocate_blocked_reg(struct live_interval
*current,
if (it->fixed_reg)
continue;
+ if (!reg_supports_type(it->reg, current->var_info->vm_type))
+ continue;
+
if (intervals_intersect(it, current)) {
pos = next_use_pos(it, interval_start(current));
set_use_pos(use_pos, it->reg, pos);
@@ -227,6 +230,9 @@ static void allocate_blocked_reg(struct live_interval
*current,
if (!it->fixed_reg)
continue;
+ if (!reg_supports_type(it->reg, current->var_info->vm_type))
+ continue;
+
if (intervals_intersect(it, current)) {
unsigned long pos;
@@ -277,6 +283,9 @@ static void try_to_allocate_free_reg(struct live_interval
*current,
}
list_for_each_entry(it, inactive, interval_node) {
+ if (!reg_supports_type(it->reg, current->var_info->vm_type))
+ continue;
+
if (intervals_intersect(it, current)) {
unsigned long pos;
--
1.6.3.3
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