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i965/fs: Use the new convenience interface for setting up reg conflicts.

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That code I wrote was impenetrable, and hard to write the first time.
This makes things a lot more obvious.
This commit is contained in:
Eric Anholt 2011-05-04 13:31:01 -07:00
parent fa43477fa3
commit bbcf13adbe
1 changed files with 6 additions and 21 deletions
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27
src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
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@ -157,29 +157,14 @@ fs_visitor::assign_regs()
classes[i] = ra_alloc_reg_class(regs);
for (int i_r = 0; i_r < class_reg_count[i]; i_r++) {
ra_class_add_reg(regs, classes[i], class_base_reg[i] + i_r);
}
int class_reg = class_base_reg[i] + i_r;
/* Add conflicts between our contiguous registers aliasing
* base regs and other register classes' contiguous registers
* that alias base regs, or the base regs themselves for classes[0].
*/
for (int c = 0; c <= i; c++) {
for (int i_r = 0; i_r < class_reg_count[i]; i_r++) {
for (int c_r = MAX2(0, i_r - (class_sizes[c] - 1));
c_r < MIN2(class_reg_count[c], i_r + class_sizes[i]);
c_r++) {
ra_class_add_reg(regs, classes[i], class_reg);
if (0) {
printf("%d/%d conflicts %d/%d\n",
class_sizes[i], first_assigned_grf + i_r,
class_sizes[c], first_assigned_grf + c_r);
}
ra_add_reg_conflict(regs,
class_base_reg[i] + i_r,
class_base_reg[c] + c_r);
}
for (int base_reg = i_r;
base_reg < i_r + class_sizes[i];
base_reg++) {
ra_add_transitive_reg_conflict(regs, base_reg, class_reg);
}
}
}