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target/mips: Support R5900 three-operand MADD and MADDU instructions

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The three-operand MADD and MADDU are specific to Sony R5900 core,
and Toshiba TX19/TX39/TX79 cores as well.

The "32-Bit TX System RISC TX39 Family Architecture manual"
is available at https://wiki.qemu.org/File:DSAE0022432.pdf

Backports commit 3b948f053fc588154d95228da8a6561c61c66104 from qemu
This commit is contained in:
Philippe Mathieu-Daudé 2019-01-05 08:03:25 -05:00 committed by Lioncash
parent 5729c803a7
commit 76bc93690f
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 53 additions and 5 deletions
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58
qemu/target/mips/translate.c
View file

@ -5093,8 +5093,8 @@ static void gen_muldiv(DisasContext *ctx, uint32_t opc,
} }
/* /*
* These MULT and MULTU instructions implemented in for example the * These MULT[U] and MADD[U] instructions implemented in for example
* Toshiba/Sony R5900 and the Toshiba TX19, TX39 and TX79 core * the Toshiba/Sony R5900 and the Toshiba TX19, TX39 and TX79 core
* architectures are special three-operand variants with the syntax * architectures are special three-operand variants with the syntax
* *
* MULT[U][1] rd, rs, rt * MULT[U][1] rd, rs, rt
@ -5103,6 +5103,14 @@ static void gen_muldiv(DisasContext *ctx, uint32_t opc,
* *
* (rd, LO, HI) <- rs * rt * (rd, LO, HI) <- rs * rt
* *
* and
*
* MADD[U] rd, rs, rt
*
* such that
*
* (rd, LO, HI) <- (LO, HI) + rs * rt
*
* where the low-order 32-bits of the result is placed into both the * where the low-order 32-bits of the result is placed into both the
* GPR rd and the special register LO. The high-order 32-bits of the * GPR rd and the special register LO. The high-order 32-bits of the
* result is placed into the special register HI. * result is placed into the special register HI.
@ -5160,8 +5168,48 @@ static void gen_mul_txx9(DisasContext *ctx, uint32_t opc,
tcg_temp_free_i32(tcg_ctx, t3); tcg_temp_free_i32(tcg_ctx, t3);
} }
break; break;
case MMI_OPC_MADD:
{
TCGv_i64 t2 = tcg_temp_new_i64(tcg_ctx);
TCGv_i64 t3 = tcg_temp_new_i64(tcg_ctx);
tcg_gen_ext_tl_i64(tcg_ctx, t2, t0);
tcg_gen_ext_tl_i64(tcg_ctx, t3, t1);
tcg_gen_mul_i64(tcg_ctx, t2, t2, t3);
tcg_gen_concat_tl_i64(tcg_ctx, t3, tcg_ctx->cpu_LO[acc], tcg_ctx->cpu_HI[acc]);
tcg_gen_add_i64(tcg_ctx, t2, t2, t3);
tcg_temp_free_i64(tcg_ctx, t3);
gen_move_low32(tcg_ctx, tcg_ctx->cpu_LO[acc], t2);
gen_move_high32(tcg_ctx, tcg_ctx->cpu_HI[acc], t2);
if (rd) {
gen_move_low32(tcg_ctx, tcg_ctx->cpu_gpr[rd], t2);
}
tcg_temp_free_i64(tcg_ctx, t2);
}
break;
case MMI_OPC_MADDU:
{
TCGv_i64 t2 = tcg_temp_new_i64(tcg_ctx);
TCGv_i64 t3 = tcg_temp_new_i64(tcg_ctx);
tcg_gen_ext32u_tl(tcg_ctx, t0, t0);
tcg_gen_ext32u_tl(tcg_ctx, t1, t1);
tcg_gen_extu_tl_i64(tcg_ctx, t2, t0);
tcg_gen_extu_tl_i64(tcg_ctx, t3, t1);
tcg_gen_mul_i64(tcg_ctx, t2, t2, t3);
tcg_gen_concat_tl_i64(tcg_ctx, t3, tcg_ctx->cpu_LO[acc], tcg_ctx->cpu_HI[acc]);
tcg_gen_add_i64(tcg_ctx, t2, t2, t3);
tcg_temp_free_i64(tcg_ctx, t3);
gen_move_low32(tcg_ctx, tcg_ctx->cpu_LO[acc], t2);
gen_move_high32(tcg_ctx, tcg_ctx->cpu_HI[acc], t2);
if (rd) {
gen_move_low32(tcg_ctx, tcg_ctx->cpu_gpr[rd], t2);
}
tcg_temp_free_i64(tcg_ctx, t2);
}
break;
default: default:
MIPS_INVAL("mul TXx9"); MIPS_INVAL("mul/madd TXx9");
generate_exception_end(ctx, EXCP_RI); generate_exception_end(ctx, EXCP_RI);
goto out; goto out;
} }
@ -27487,6 +27535,8 @@ static void decode_mmi(CPUMIPSState *env, DisasContext *ctx)
break; break;
case MMI_OPC_MULT1: case MMI_OPC_MULT1:
case MMI_OPC_MULTU1: case MMI_OPC_MULTU1:
case MMI_OPC_MADD:
case MMI_OPC_MADDU:
gen_mul_txx9(ctx, opc, rd, rs, rt); gen_mul_txx9(ctx, opc, rd, rs, rt);
break; break;
case MMI_OPC_DIV1: case MMI_OPC_DIV1:
@ -27501,8 +27551,6 @@ static void decode_mmi(CPUMIPSState *env, DisasContext *ctx)
case MMI_OPC_MFHI1: case MMI_OPC_MFHI1:
gen_HILO1_tx79(ctx, opc, rd); gen_HILO1_tx79(ctx, opc, rd);
break; break;
case MMI_OPC_MADD: /* TODO: MMI_OPC_MADD */
case MMI_OPC_MADDU: /* TODO: MMI_OPC_MADDU */
case MMI_OPC_PLZCW: /* TODO: MMI_OPC_PLZCW */ case MMI_OPC_PLZCW: /* TODO: MMI_OPC_PLZCW */
case MMI_OPC_MADD1: /* TODO: MMI_OPC_MADD1 */ case MMI_OPC_MADD1: /* TODO: MMI_OPC_MADD1 */
case MMI_OPC_MADDU1: /* TODO: MMI_OPC_MADDU1 */ case MMI_OPC_MADDU1: /* TODO: MMI_OPC_MADDU1 */