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intel/fs/ra: Stop adding RA interference to too many SENDS nodes

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We only have one node per VGRF so this was adding way too much
interference.  No idea how we didn't catch this before.

Shader-db results on Kaby Lake:

    total instructions in shared programs: 15311100 -> 15311100 (0.00%)
    instructions in affected programs: 0 -> 0
    helped: 0
    HURT: 0

    total cycles in shared programs: 355468050 -> 355543197 (0.02%)
    cycles in affected programs: 2472492 -> 2547639 (3.04%)
    helped: 17
    HURT: 20

Fixes: 014edff0d2 "intel/fs: Add interference between SENDS sources"
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand
2019-05-08 12:41:31 -05:00
parent 5911abd76f
commit 096ad8a809
1 changed files with 3 additions and 8 deletions
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11
src/intel/compiler/brw_fs_reg_allocate.cpp
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@@ -710,14 +710,9 @@ fs_visitor::assign_regs(bool allow_spilling, bool spill_all)
if (inst->opcode == SHADER_OPCODE_SEND && inst->ex_mlen > 0 &&
inst->src[2].file == VGRF &&
inst->src[3].file == VGRF &&
inst->src[2].nr != inst->src[3].nr) {
for (unsigned i = 0; i < inst->mlen; i++) {
for (unsigned j = 0; j < inst->ex_mlen; j++) {
ra_add_node_interference(g, inst->src[2].nr + i,
inst->src[3].nr + j);
}
}
}
inst->src[2].nr != inst->src[3].nr)
ra_add_node_interference(g, inst->src[2].nr,
inst->src[3].nr);
}
}