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util/ra: Add a function for making all conflicts on a register transitive

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Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jason Ekstrand 2015-08-15 09:43:05 -07:00
parent 7c8e53f1be
commit 9b49284c22
2 changed files with 24 additions and 0 deletions
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23
src/util/register_allocate.c
View file

@ -266,6 +266,29 @@ ra_add_transitive_reg_conflict(struct ra_regs *regs,
}
}
/**
* Makes every conflict on the given register transitive. In other words,
* every register that conflicts with r will now conflict with every other
* register conflicting with r.
*
* This can simplify code for setting up multiple register classes
* which are aggregates of some base hardware registers, compared to
* explicitly using ra_add_reg_conflict.
*/
void
ra_make_reg_conflicts_transitive(struct ra_regs *regs, unsigned int r)
{
struct ra_reg *reg = &regs->regs[r];
BITSET_WORD tmp;
int c;
BITSET_FOREACH_SET(c, tmp, reg->conflicts, regs->count) {
struct ra_reg *other = &regs->regs[c];
for (unsigned i = 0; i < BITSET_WORDS(regs->count); i++)
other->conflicts[i] |= reg->conflicts[i];
}
}
unsigned int
ra_alloc_reg_class(struct ra_regs *regs)
{

1
src/util/register_allocate.h
View file

@ -51,6 +51,7 @@ void ra_add_reg_conflict(struct ra_regs *regs,
unsigned int r1, unsigned int r2);
void ra_add_transitive_reg_conflict(struct ra_regs *regs,
unsigned int base_reg, unsigned int reg);
void ra_make_reg_conflicts_transitive(struct ra_regs *regs, unsigned int reg);
void ra_class_add_reg(struct ra_regs *regs, unsigned int c, unsigned int reg);
void ra_set_num_conflicts(struct ra_regs *regs, unsigned int class_a,
unsigned int class_b, unsigned int num_conflicts);