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aco: select v_mad_u32_u16 for 16-bit multiplications on GFX9+

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Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7425>
This commit is contained in:
Samuel Pitoiset 2020-11-02 14:46:03 +01:00 • committed by Marge Bot
parent bbdafd6ab3
commit 7028e9875f
1 changed files with 9 additions and 1 deletions
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10
src/amd/compiler/aco_instruction_selection.cpp
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@ -1724,7 +1724,15 @@ void visit_alu_instr(isel_context *ctx, nir_alu_instr *instr)
uint32_t src0_ub = get_alu_src_ub(ctx, instr, 0);
uint32_t src1_ub = get_alu_src_ub(ctx, instr, 1);
if (src0_ub <= 0xffffff && src1_ub <= 0xffffff) {
if (src0_ub <= 0xffff && src1_ub <= 0xffff &&
ctx->options->chip_class >= GFX9) {
/* Initialize the accumulator to 0 to allow further combinations
* in the optimizer.
*/
Operand op0(get_alu_src(ctx, instr->src[0]));
Operand op1(get_alu_src(ctx, instr->src[1]));
bld.vop3(aco_opcode::v_mad_u32_u16, Definition(dst), bld.set16bit(op0), bld.set16bit(op1), Operand(0u));
} else if (src0_ub <= 0xffffff && src1_ub <= 0xffffff) {
emit_vop2_instruction(ctx, instr, aco_opcode::v_mul_u32_u24, dst, true);
} else {
emit_vop3a_instruction(ctx, instr, aco_opcode::v_mul_lo_u32, dst);