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i965/vec4: Fix handling of multiple register reads and writes in dead_code_eliminate().

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Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Francisco Jerez 2015-03-18 21:06:28 +02:00
parent 2babde35b9
commit 3d1bba7c9b
1 changed files with 15 additions and 7 deletions
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22
src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp
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@ -80,8 +80,10 @@ vec4_visitor::dead_code_eliminate()
if (inst->dst.file == GRF && !inst->has_side_effects()) {
bool result_live[4] = { false };
for (int c = 0; c < 4; c++) {
result_live[c] = BITSET_TEST(live, var_from_reg(alloc, inst->dst, c));
for (unsigned i = 0; i < inst->regs_written; i++) {
for (int c = 0; c < 4; c++)
result_live[c] |= BITSET_TEST(
live, var_from_reg(alloc, offset(inst->dst, i), c));
}
/* If the instruction can't do writemasking, then it's all or
@ -122,9 +124,12 @@ vec4_visitor::dead_code_eliminate()
}
if (inst->dst.file == GRF && !inst->predicate) {
for (int c = 0; c < 4; c++) {
if (inst->dst.writemask & (1 << c)) {
BITSET_CLEAR(live, var_from_reg(alloc, inst->dst, c));
for (unsigned i = 0; i < inst->regs_written; i++) {
for (int c = 0; c < 4; c++) {
if (inst->dst.writemask & (1 << c)) {
BITSET_CLEAR(live, var_from_reg(alloc,
offset(inst->dst, i), c));
}
}
}
}
@ -135,8 +140,11 @@ vec4_visitor::dead_code_eliminate()
for (int i = 0; i < 3; i++) {
if (inst->src[i].file == GRF) {
for (int c = 0; c < 4; c++) {
BITSET_SET(live, var_from_reg(alloc, inst->src[i], c));
for (unsigned j = 0; j < inst->regs_read(i); j++) {
for (int c = 0; c < 4; c++) {
BITSET_SET(live, var_from_reg(alloc,
offset(inst->src[i], j), c));
}
}
}
}