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aco: implement 64bit div find_lsb

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This can be selected for divergent subgroupBallotFindLSB.

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25407>
(cherry picked from commit b91616e800)
This commit is contained in:
Georg Lehmann 2023-09-26 18:29:31 +02:00 • committed by Eric Engestrom
parent c7b62757aa
commit 140c7ab73d
2 changed files with 8 additions and 1 deletions
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2
.pick_status.json
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@ -1084,7 +1084,7 @@
"description": "aco: implement 64bit div find_lsb",
"nominated": true,
"nomination_type": 0,
"resolution": 0,
"resolution": 1,
"main_sha": null,
"because_sha": null
},

7
src/amd/compiler/aco_instruction_selection.cpp
View file

@ -1763,6 +1763,13 @@ visit_alu_instr(isel_context* ctx, nir_alu_instr* instr)
emit_vop1_instruction(ctx, instr, aco_opcode::v_ffbl_b32, dst);
} else if (src.regClass() == s2) {
bld.sop1(aco_opcode::s_ff1_i32_b64, Definition(dst), src);
} else if (src.regClass() == v2) {
Temp lo = bld.tmp(v1), hi = bld.tmp(v1);
bld.pseudo(aco_opcode::p_split_vector, Definition(lo), Definition(hi), src);
lo = bld.vop1(aco_opcode::v_ffbl_b32, bld.def(v1), lo);
hi = bld.vop1(aco_opcode::v_ffbl_b32, bld.def(v1), hi);
hi = uadd32_sat(bld, bld.def(v1), bld.copy(bld.def(s1), Operand::c32(32u)), hi);
bld.vop2(aco_opcode::v_min_u32, Definition(dst), lo, hi);
} else {
isel_err(&instr->instr, "Unimplemented NIR instr bit size");
}