fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2025-12-25 04:20:08 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

vc4: Allow copy propagation of uniforms.

Browse source 
Fixes 12 piglit tests (and 8 more crash -> fail) from reducing register
pressure.
This commit is contained in:
Eric Anholt 2014-09-16 16:03:39 -07:00
parent 79be2cc383
commit 71d4fc88d6
1 changed files with 15 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
src/gallium/drivers/vc4/vc4_opt_copy_propagation.c
View file

@ -45,10 +45,22 @@ qir_opt_copy_propagation(struct vc4_compile *c)
foreach(node, &c->instructions) {
struct qinst *inst = (struct qinst *)node;
/* A single instruction can only read one uniform value. (It
* could maybe read the same uniform value in two operands,
* but that doesn't seem important to do).
*/
bool reads_a_uniform = false;
for (int i = 0; i < qir_get_op_nsrc(inst->op); i++) {
if (inst->src[i].file == QFILE_UNIF)
reads_a_uniform = true;
}
for (int i = 0; i < qir_get_op_nsrc(inst->op); i++) {
int index = inst->src[i].index;
if (inst->src[i].file == QFILE_TEMP &&
movs[index].file == QFILE_TEMP) {
(movs[index].file == QFILE_TEMP ||
(movs[index].file == QFILE_UNIF &&
!reads_a_uniform))) {
if (debug) {
fprintf(stderr, "Copy propagate: ");
qir_dump_inst(inst);
@ -56,6 +68,8 @@ qir_opt_copy_propagation(struct vc4_compile *c)
}
inst->src[i] = movs[index];
if (movs[index].file == QFILE_UNIF)
reads_a_uniform = true;
if (debug) {
fprintf(stderr, "to: ");