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i965: Don't make instructions with a null dest a barrier to scheduling.

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Now that we properly track accumulator dependencies, the scheduler is
able to schedule instructions between the mach and mov in the common
the integer multiplication pattern:

   mul  acc0, x, y
   mach null, x, y
   mov  dest, acc0

Since a null destination implies no dependency on the destination, we
can also safely schedule instructions (that don't write the accumulator)
between the mul and mach.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2014-04-09 13:38:14 -07:00
parent a6860100b8
commit 42a26cb5e4
1 changed files with 8 additions and 4 deletions
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12
src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp
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@ -870,7 +870,8 @@ fs_instruction_scheduler::calculate_deps()
} else if (inst->dst.is_accumulator() && gen6plus) {
add_dep(last_accumulator_write, n);
last_accumulator_write = n;
} else if (inst->dst.file != BAD_FILE) {
} else if (inst->dst.file != BAD_FILE &&
!inst->dst.is_null()) {
add_barrier_deps(n);
}
@ -997,7 +998,8 @@ fs_instruction_scheduler::calculate_deps()
}
} else if (inst->dst.is_accumulator() && gen6plus) {
last_accumulator_write = n;
} else if (inst->dst.file != BAD_FILE) {
} else if (inst->dst.file != BAD_FILE &&
!inst->dst.is_null()) {
add_barrier_deps(n);
}
@ -1113,7 +1115,8 @@ vec4_instruction_scheduler::calculate_deps()
} else if (inst->dst.is_accumulator() && gen6plus) {
add_dep(last_accumulator_write, n);
last_accumulator_write = n;
} else if (inst->dst.file != BAD_FILE) {
} else if (inst->dst.file != BAD_FILE &&
!inst->dst.is_null()) {
add_barrier_deps(n);
}
@ -1205,7 +1208,8 @@ vec4_instruction_scheduler::calculate_deps()
last_fixed_grf_write = n;
} else if (inst->dst.is_accumulator() && gen6plus) {
last_accumulator_write = n;
} else if (inst->dst.file != BAD_FILE) {
} else if (inst->dst.file != BAD_FILE &&
!inst->dst.is_null()) {
add_barrier_deps(n);
}