diff options
| author | Connor Abbott <[email protected]> | 2015-06-07 00:37:27 -0400 |
|---|---|---|
| committer | Connor Abbott <[email protected]> | 2015-10-30 02:18:56 -0400 |
| commit | 85fce2d2f50335b1d204dbaedc36cdd37164a9c0 (patch) | |
| tree | fc3742849ce9a717691feaf453ce56aab126cdb2 /src | |
| parent | 6f231fddff1661c2ca2cfb7bb7a0e6a970bcbf40 (diff) | |
i965/sched: write-after-read dependencies are free
Although write-after-write dependencies have the same latency as
read-after-write dependencies due to how the register scoreboard works,
write-after-read dependencies aren't checked by the EU at all, so
they're purely a constraint on how the scheduler can order the
instructions.
v2: fix accumulator dependencies too.
Reviewed-by: Jason Ekstrand <[email protected]>
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp b/src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp index 3e86cb05cce..094c47aba37 100644 --- a/src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp +++ b/src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp @@ -927,10 +927,10 @@ fs_instruction_scheduler::calculate_deps() if (inst->src[i].file == GRF) { if (post_reg_alloc) { for (int r = 0; r < inst->regs_read(i); r++) - add_dep(n, last_grf_write[inst->src[i].reg + r]); + add_dep(n, last_grf_write[inst->src[i].reg + r], 0); } else { for (int r = 0; r < inst->regs_read(i); r++) { - add_dep(n, last_grf_write[inst->src[i].reg * 16 + inst->src[i].reg_offset + r]); + add_dep(n, last_grf_write[inst->src[i].reg * 16 + inst->src[i].reg_offset + r], 0); } } } else if (inst->src[i].file == HW_REG && @@ -941,12 +941,12 @@ fs_instruction_scheduler::calculate_deps() if (inst->src[i].fixed_hw_reg.vstride == BRW_VERTICAL_STRIDE_0) size = 1; for (int r = 0; r < size; r++) - add_dep(n, last_grf_write[inst->src[i].fixed_hw_reg.nr + r]); + add_dep(n, last_grf_write[inst->src[i].fixed_hw_reg.nr + r], 0); } else { - add_dep(n, last_fixed_grf_write); + add_dep(n, last_fixed_grf_write, 0); } } else if (inst->src[i].is_accumulator()) { - add_dep(n, last_accumulator_write); + add_dep(n, last_accumulator_write, 0); } else if (inst->src[i].file != BAD_FILE && inst->src[i].file != IMM && inst->src[i].file != UNIFORM && |