On 4/26/22 05:50, Lucas Mateus Castro(alqotel) wrote:
From: "Lucas Mateus Castro (alqotel)"<[email protected]>
Implement the following PowerISA v3.1 instructions:
xxmfacc: VSX Move From Accumulator
xxmtacc: VSX Move To Accumulator
xxsetaccz: VSX Set Accumulator to Zero
The PowerISA 3.1 mentions that for the current version of the
architecture, "the hardware implementation provides the effect of ACC[i]
and VSRs 4*i to 4*i + 3 logically containing the same data" and "The
Accumulators introduce no new logical state at this time" (page 501).
For now it seems unnecessary to create new structures, so this patch
just uses ACC[i] as VSRs 4*i to 4*i+3 and therefore move to and from
accumulators are no-ops.
Signed-off-by: Lucas Mateus Castro (alqotel)<[email protected]>
---
target/ppc/insn32.decode | 9 ++++++++
target/ppc/translate/vsx-impl.c.inc | 36 +++++++++++++++++++++++++++++
2 files changed, 45 insertions(+)
Reviewed-by: Richard Henderson <[email protected]>
+ TCGv_i64 zero = tcg_constant_i64(0);
+ for (i = 0; i < 4; i++) {
+ set_cpu_vsr(a->ra * 4 + i, zero, false);
+ set_cpu_vsr(a->ra * 4 + i, zero, true);
+ }
or
tcg_gen_gvec_dup_imm(MO_64, acc_full_offset(a->ra), 64, 64, 0);
r~
