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aco: micro optimize VALU fquantize2f16

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Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29245>
This commit is contained in:
Georg Lehmann
2023-09-22 11:12:05 +02:00
committed by Marge Bot
parent 5b4fcfd638
commit 5e8bb93ea3
1 changed files with 17 additions and 13 deletions
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30
src/amd/compiler/aco_instruction_selection.cpp
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@@ -3652,34 +3652,38 @@ visit_alu_instr(isel_context* ctx, nir_alu_instr* instr)
f16 = bld.vop1(aco_opcode::p_v_cvt_f16_f32_rtne, bld.def(v2b), src);
else
f16 = bld.vop1(aco_opcode::v_cvt_f16_f32, bld.def(v2b), src);
Temp f32, cmp_res;
if (ctx->block->fp_mode.denorm16_64 != fp_denorm_keep) {
bld.vop1(aco_opcode::v_cvt_f32_f16, Definition(dst), f16);
break;
}
Temp denorm_zero;
Temp f32 = bld.vop1(aco_opcode::v_cvt_f32_f16, bld.def(v1), f16);
if (ctx->program->gfx_level >= GFX8) {
Temp mask =
bld.copy(bld.def(s1),
Operand::c32(0x36Fu)); /* value is NOT negative/positive denormal value */
cmp_res = bld.vopc_e64(aco_opcode::v_cmp_class_f16, bld.def(bld.lm), f16, mask);
f32 = bld.vop1(aco_opcode::v_cvt_f32_f16, bld.def(v1), f16);
/* value is negative/positive denormal value/zero */
Instruction* tmp0 =
bld.vopc_e64(aco_opcode::v_cmp_class_f16, bld.def(bld.lm), f16, Operand::c32(0x30));
tmp0->valu().abs[0] = true;
tmp0->valu().neg[0] = true;
denorm_zero = tmp0->definitions[0].getTemp();
} else {
/* 0x38800000 is smallest half float value (2^-14) in 32-bit float,
* so compare the result and flush to 0 if it's smaller.
*/
f32 = bld.vop1(aco_opcode::v_cvt_f32_f16, bld.def(v1), f16);
Temp smallest = bld.copy(bld.def(s1), Operand::c32(0x38800000u));
Instruction* tmp0 =
bld.vopc_e64(aco_opcode::v_cmp_lt_f32, bld.def(bld.lm), f32, smallest);
tmp0->valu().abs[0] = true;
Temp tmp1 = bld.vopc(aco_opcode::v_cmp_lg_f32, bld.def(bld.lm), Operand::zero(), f32);
cmp_res = bld.sop2(aco_opcode::s_nand_b64, bld.def(s2), bld.def(s1, scc),
tmp0->definitions[0].getTemp(), tmp1);
denorm_zero = tmp0->definitions[0].getTemp();
}
if (ctx->block->fp_mode.preserve_signed_zero_inf_nan32) {
Temp copysign_0 =
bld.vop2(aco_opcode::v_mul_f32, bld.def(v1), Operand::zero(), as_vgpr(ctx, src));
bld.vop2(aco_opcode::v_cndmask_b32, Definition(dst), copysign_0, f32, cmp_res);
bld.vop2(aco_opcode::v_cndmask_b32, Definition(dst), f32, copysign_0, denorm_zero);
} else {
bld.vop2(aco_opcode::v_cndmask_b32, Definition(dst), Operand::zero(), f32, cmp_res);
bld.vop2_e64(aco_opcode::v_cndmask_b32, Definition(dst), f32, Operand::zero(),
denorm_zero);
}
} else if (dst.regClass() == s1) {
Temp f16;