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aco: change fneg for VOP3P to use fmul with +1.0

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This will be useful to be able to also apply
fneg_lo and fneg_hi.

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13688>
This commit is contained in:
Daniel Schürmann 2021-11-04 18:40:44 +01:00
parent 193bd740ab
commit 62bcfcd0a8
2 changed files with 8 additions and 5 deletions
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7
src/amd/compiler/aco_instruction_selection.cpp
View file

@ -2230,8 +2230,11 @@ visit_alu_instr(isel_context* ctx, nir_alu_instr* instr)
case nir_op_fneg: {
if (dst.regClass() == v1 && instr->dest.dest.ssa.bit_size == 16) {
Temp src = get_alu_src_vop3p(ctx, instr->src[0]);
bld.vop3p(aco_opcode::v_pk_mul_f16, Definition(dst), src, Operand::c16(0xBC00),
instr->src[0].swizzle[0] & 1, instr->src[0].swizzle[1] & 1);
Instruction* vop3p =
bld.vop3p(aco_opcode::v_pk_mul_f16, Definition(dst), src, Operand::c16(0x3C00),
instr->src[0].swizzle[0] & 1, instr->src[0].swizzle[1] & 1);
vop3p->vop3p().neg_lo[0] = true;
vop3p->vop3p().neg_hi[0] = true;
emit_split_vector(ctx, dst, 2);
break;
}

6
src/amd/compiler/aco_optimizer.cpp
View file

@ -3158,7 +3158,7 @@ combine_vop3p(opt_ctx& ctx, aco_ptr<Instruction>& instr)
ssa_info& info = ctx.info[op.tempId()];
if (info.is_vop3p() && info.instr->opcode == aco_opcode::v_pk_mul_f16 &&
info.instr->operands[1].constantEquals(0xBC00)) {
info.instr->operands[1].constantEquals(0x3C00)) {
Operand ops[3];
for (unsigned j = 0; j < instr->operands.size(); j++)
ops[j] = instr->operands[j];
@ -3177,8 +3177,8 @@ combine_vop3p(opt_ctx& ctx, aco_ptr<Instruction>& instr)
*/
bool opsel_lo = (vop3p->opsel_lo >> i) & 1;
bool opsel_hi = (vop3p->opsel_hi >> i) & 1;
bool neg_lo = true ^ fneg->neg_lo[0] ^ fneg->neg_lo[1];
bool neg_hi = true ^ fneg->neg_hi[0] ^ fneg->neg_hi[1];
bool neg_lo = fneg->neg_lo[0] ^ fneg->neg_lo[1];
bool neg_hi = fneg->neg_hi[0] ^ fneg->neg_hi[1];
vop3p->neg_lo[i] ^= opsel_lo ? neg_hi : neg_lo;
vop3p->neg_hi[i] ^= opsel_hi ? neg_hi : neg_lo;
vop3p->opsel_lo ^= ((opsel_lo ? ~fneg->opsel_hi : fneg->opsel_lo) & 1) << i;