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nak: sm50: Implement FFMA

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Signed-off-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26114>
This commit is contained in:
Mary Guillemard 2023-11-13 16:20:20 +01:00 • committed by Marge Bot
parent f02b2866bc
commit cb3263560f
2 changed files with 47 additions and 0 deletions
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42
src/nouveau/compiler/nak/encode_sm50.rs
View file

@ -1350,6 +1350,47 @@ impl SM50Instr {
self.set_dst(op.dst);
}
fn encode_ffma(&mut self, op: &OpFFma) {
/* TODO: FFMA in the 32 bits immediate form use the dest as source 2 */
assert!(op.srcs[1].as_imm_not_i20().is_none());
// FFMA doesn't have any abs flags.
assert!(!op.srcs[0].src_mod.has_fabs());
assert!(!op.srcs[1].src_mod.has_fabs());
assert!(!op.srcs[2].src_mod.has_fabs());
match &op.srcs[1].src_ref {
SrcRef::Zero | SrcRef::Reg(_) => {
self.set_opcode(0x5980);
self.set_reg_src_ref(20..28, op.srcs[1].src_ref);
}
SrcRef::Imm32(i) => {
self.set_opcode(0x3280);
self.set_src_imm_i20(20..39, 56, *i);
}
SrcRef::CBuf(cb) => {
self.set_opcode(0x4980);
self.set_src_cb(20..39, cb);
}
src1 => panic!("unsupported src1 type for IMUL: {src1}"),
}
self.set_dst(op.dst);
self.set_reg_src_ref(8..16, op.srcs[0].src_ref);
self.set_reg_src_ref(39..47, op.srcs[2].src_ref);
self.set_bit(
48,
op.srcs[0].src_mod.has_fneg() ^ op.srcs[1].src_mod.has_fneg(),
);
self.set_bit(49, op.srcs[2].src_mod.has_fneg());
self.set_bit(50, op.saturate);
self.set_rnd_mode(51..53, op.rnd_mode);
self.set_bit(53, false); /* TODO: FTZ */
self.set_bit(54, false); /* TODO: DNZ */
}
fn set_float_cmp_op(&mut self, range: Range<usize>, op: FloatCmpOp) {
assert!(range.len() == 4);
self.set_field(
@ -1575,6 +1616,7 @@ impl SM50Instr {
Op::FAdd(op) => si.encode_fadd(&op),
Op::FMnMx(op) => si.encode_fmnmx(&op),
Op::FMul(op) => si.encode_fmul(&op),
Op::FFma(op) => si.encode_ffma(&op),
Op::FSet(op) => si.encode_fset(&op),
Op::FSetP(op) => si.encode_fsetp(&op),
Op::MuFu(op) => si.encode_mufu(&op),

5
src/nouveau/compiler/nak/legalize.rs
View file

@ -161,6 +161,11 @@ fn legalize_sm50_instr(
copy_src_if_not_reg(b, &mut op.sel, RegFile::GPR);
copy_src_if_not_reg(b, &mut op.srcs[1], RegFile::GPR);
}
Op::FFma(op) => {
copy_src_if_not_reg(b, &mut op.srcs[0], RegFile::GPR);
copy_src_if_not_reg(b, &mut op.srcs[1], RegFile::GPR);
copy_src_if_not_reg(b, &mut op.srcs[2], RegFile::GPR);
}
Op::Copy(_) => (), // Nothing to do
_ => {
let src_types = instr.src_types();