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target/mips/mxu: Add D16MACF D16MACE instructions 

These instructions are close to D16MAC so common generation function
provided.

Signed-off-by: Siarhei Volkau <lis8215@gmail.com>
Message-Id: <20230608104222.1520143-12-lis8215@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Siarhei Volkau 2023-06-08 13:42:00 +03:00 committed by Philippe Mathieu-Daudé
parent 27dc0e289c
commit 2ebc66e415
1 changed files with 68 additions and 6 deletions
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74
target/mips/tcg/mxu_translate.c
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@ -363,6 +363,8 @@ enum {
OPC_MXU_D16MUL = 0x08,
OPC_MXU__POOL03 = 0x09,
OPC_MXU_D16MAC = 0x0A,
OPC_MXU_D16MACF = 0x0B,
OPC_MXU_D16MACE = 0x0F,
OPC_MXU__POOL04 = 0x10,
OPC_MXU__POOL05 = 0x11,
OPC_MXU__POOL06 = 0x12,
@ -772,10 +774,15 @@ static void gen_mxu_d16mul(DisasContext *ctx, bool fractional,
}
/*
* D16MAC XRa, XRb, XRc, XRd, aptn2, optn2 - Signed 16 bit pattern multiply
* and accumulate
* D16MAC XRa, XRb, XRc, XRd, aptn2, optn2
* Signed 16 bit pattern multiply and accumulate
* D16MACF XRa, XRb, XRc, aptn2, optn2
* Signed Q15 fraction pattern multiply accumulate and pack
* D16MACE XRa, XRb, XRc, XRd, aptn2, optn2
* Signed Q15 fraction pattern multiply and accumulate
*/
static void gen_mxu_d16mac(DisasContext *ctx)
static void gen_mxu_d16mac(DisasContext *ctx, bool fractional,
bool packed_result)
{
TCGv t0, t1, t2, t3;
uint32_t XRa, XRb, XRc, XRd, optn2, aptn2;
@ -818,6 +825,11 @@ static void gen_mxu_d16mac(DisasContext *ctx)
tcg_gen_mul_tl(t2, t1, t2);
break;
}
if (fractional) {
tcg_gen_shli_tl(t3, t3, 1);
tcg_gen_shli_tl(t2, t2, 1);
}
gen_load_mxu_gpr(t0, XRa);
gen_load_mxu_gpr(t1, XRd);
@ -839,8 +851,52 @@ static void gen_mxu_d16mac(DisasContext *ctx)
tcg_gen_sub_tl(t2, t1, t2);
break;
}
gen_store_mxu_gpr(t3, XRa);
gen_store_mxu_gpr(t2, XRd);
if (fractional) {
TCGLabel *l_done = gen_new_label();
TCGv rounding = tcg_temp_new();
tcg_gen_andi_tl(rounding, mxu_CR, 0x2);
tcg_gen_brcondi_tl(TCG_COND_EQ, rounding, 0, l_done);
if (packed_result) {
TCGLabel *l_apply_bias_l = gen_new_label();
TCGLabel *l_apply_bias_r = gen_new_label();
TCGLabel *l_half_done = gen_new_label();
TCGv bias = tcg_temp_new();
/*
* D16MACF supports unbiased rounding aka "bankers rounding",
* "round to even", "convergent rounding"
*/
tcg_gen_andi_tl(bias, mxu_CR, 0x4);
tcg_gen_brcondi_tl(TCG_COND_NE, bias, 0, l_apply_bias_l);
tcg_gen_andi_tl(t0, t3, 0x1ffff);
tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 0x8000, l_half_done);
gen_set_label(l_apply_bias_l);
tcg_gen_addi_tl(t3, t3, 0x8000);
gen_set_label(l_half_done);
tcg_gen_brcondi_tl(TCG_COND_NE, bias, 0, l_apply_bias_r);
tcg_gen_andi_tl(t0, t2, 0x1ffff);
tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 0x8000, l_done);
gen_set_label(l_apply_bias_r);
tcg_gen_addi_tl(t2, t2, 0x8000);
} else {
/* D16MACE doesn't support unbiased rounding */
tcg_gen_addi_tl(t3, t3, 0x8000);
tcg_gen_addi_tl(t2, t2, 0x8000);
}
gen_set_label(l_done);
}
if (!packed_result) {
gen_store_mxu_gpr(t3, XRa);
gen_store_mxu_gpr(t2, XRd);
} else {
tcg_gen_andi_tl(t3, t3, 0xffff0000);
tcg_gen_shri_tl(t2, t2, 16);
tcg_gen_or_tl(t3, t3, t2);
gen_store_mxu_gpr(t3, XRa);
}
}
/*
@ -2698,7 +2754,13 @@ bool decode_ase_mxu(DisasContext *ctx, uint32_t insn)
gen_mxu_d16mul(ctx, false, false);
break;
case OPC_MXU_D16MAC:
gen_mxu_d16mac(ctx);
gen_mxu_d16mac(ctx, false, false);
break;
case OPC_MXU_D16MACF:
gen_mxu_d16mac(ctx, true, true);
break;
case OPC_MXU_D16MACE:
gen_mxu_d16mac(ctx, true, false);
break;
case OPC_MXU__POOL01:
decode_opc_mxu__pool01(ctx);