Mesa (master): ra: Use a bitset for storing which registers belong to a class.
Kenneth Graunke
kwg at kemper.freedesktop.org
Tue Mar 18 17:36:10 UTC 2014
Module: Mesa
Branch: master
Commit: da1cce2d68b847bdc7783376a6f8d08d123e7c71
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=da1cce2d68b847bdc7783376a6f8d08d123e7c71
Author: Kenneth Graunke <kenneth at whitecape.org>
Date: Fri Feb 21 19:50:15 2014 -0800
ra: Use a bitset for storing which registers belong to a class.
This should use 1/8 the memory.
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Matt Turner <mattst88 at gmail.com>
Reviewed-by: Brian Paul <brianp at vmware.com>
Reviewed-by: Christoph Brill <egore911 at gmail.com>
---
src/mesa/program/register_allocate.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/src/mesa/program/register_allocate.c b/src/mesa/program/register_allocate.c
index c763b96..d5b4423 100644
--- a/src/mesa/program/register_allocate.c
+++ b/src/mesa/program/register_allocate.c
@@ -99,7 +99,12 @@ struct ra_regs {
};
struct ra_class {
- bool *regs;
+ /**
+ * Bitset indicating which registers belong to this class.
+ *
+ * (If bit N is set, then register N belongs to this class.)
+ */
+ BITSET_WORD *regs;
/**
* p(B) in Runeson/Nyström paper.
@@ -269,7 +274,7 @@ ra_alloc_reg_class(struct ra_regs *regs)
class = rzalloc(regs, struct ra_class);
regs->classes[regs->class_count] = class;
- class->regs = rzalloc_array(class, bool, regs->count);
+ class->regs = rzalloc_array(class, BITSET_WORD, BITSET_WORDS(regs->count));
return regs->class_count++;
}
@@ -279,7 +284,7 @@ ra_class_add_reg(struct ra_regs *regs, unsigned int c, unsigned int r)
{
struct ra_class *class = regs->classes[c];
- class->regs[r] = true;
+ BITSET_SET(class->regs, r);
class->p++;
}
@@ -289,7 +294,7 @@ ra_class_add_reg(struct ra_regs *regs, unsigned int c, unsigned int r)
static bool
reg_belongs_to_class(unsigned int r, struct ra_class *c)
{
- return c->regs[r];
+ return BITSET_TEST(c->regs, r);
}
/**
@@ -333,7 +338,7 @@ ra_set_finalize(struct ra_regs *regs, unsigned int **q_values)
for (i = 0; i < regs->regs[rc].num_conflicts; i++) {
unsigned int rb = regs->regs[rc].conflict_list[i];
- if (regs->classes[b]->regs[rb])
+ if (BITSET_TEST(regs->classes[b]->regs, rb))
conflicts++;
}
max_conflicts = MAX2(max_conflicts, conflicts);
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