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target/ppc: Implement xxm[tf]acc and xxsetaccz 

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) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220524140537.27451-2-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
master
Lucas Mateus Castro (alqotel) 2022-05-24 11:05:30 -03:00 committed by Daniel Henrique Barboza
parent 03abfd90cf
commit a702c5339e
3 changed files with 45 additions and 0 deletions
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5
target/ppc/cpu.h
View File

@ -2663,6 +2663,11 @@ static inline int vsr_full_offset(int i)
return offsetof(CPUPPCState, vsr[i].u64[0]);
}
static inline int acc_full_offset(int i)
{
return vsr_full_offset(i * 4);
}
static inline int fpr_offset(int i)
{
return vsr64_offset(i, true);

9
target/ppc/insn32.decode
View File

@ -154,6 +154,9 @@
&X_vrt_frbp vrt frbp
@X_vrt_frbp ...... vrt:5 ..... ....0 .......... . &X_vrt_frbp frbp=%x_frbp
&X_a ra
@X_a ...... ra:3 .. ..... ..... .......... . &X_a
%xx_xt 0:1 21:5
%xx_xb 1:1 11:5
%xx_xa 2:1 16:5
@ -734,3 +737,9 @@ XVTLSBB 111100 ... -- 00010 ..... 111011011 . - @XX2_bf_xb
&XL_s s:uint8_t
@XL_s ......-------------- s:1 .......... - &XL_s
RFEBB 010011-------------- . 0010010010 - @XL_s
## Accumulator Instructions
XXMFACC 011111 ... -- 00000 ----- 0010110001 - @X_a
XXMTACC 011111 ... -- 00001 ----- 0010110001 - @X_a
XXSETACCZ 011111 ... -- 00011 ----- 0010110001 - @X_a

31
target/ppc/translate/vsx-impl.c.inc
View File

@ -2816,6 +2816,37 @@ static bool trans_XVCVBF16SPN(DisasContext *ctx, arg_XX2 *a)
return true;
}
/*
* 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 ACC[i] is the same as VSRs 4*i to 4*i+3 and therefore
* move to and from accumulators are no-ops.
*/
static bool trans_XXMFACC(DisasContext *ctx, arg_X_a *a)
{
REQUIRE_INSNS_FLAGS2(ctx, ISA310);
REQUIRE_VSX(ctx);
return true;
}
static bool trans_XXMTACC(DisasContext *ctx, arg_X_a *a)
{
REQUIRE_INSNS_FLAGS2(ctx, ISA310);
REQUIRE_VSX(ctx);
return true;
}
static bool trans_XXSETACCZ(DisasContext *ctx, arg_X_a *a)
{
REQUIRE_INSNS_FLAGS2(ctx, ISA310);
REQUIRE_VSX(ctx);
tcg_gen_gvec_dup_imm(MO_64, acc_full_offset(a->ra), 64, 64, 0);
return true;
}
#undef GEN_XX2FORM
#undef GEN_XX3FORM
#undef GEN_XX2IFORM