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[Qemu-devel] [PATCH 4/7] target/mips: Add MXU instruction D16MUL
From: |
Craig Janeczek |
Subject: |
[Qemu-devel] [PATCH 4/7] target/mips: Add MXU instruction D16MUL |
Date: |
Fri, 24 Aug 2018 15:44:05 -0400 |
Adds support for emulating the D16MUL instruction.
Signed-off-by: Craig Janeczek <address@hidden>
---
target/mips/translate.c | 55 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 54 insertions(+), 1 deletion(-)
diff --git a/target/mips/translate.c b/target/mips/translate.c
index 4ccccd5849..64fc6089bb 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -365,6 +365,7 @@ enum {
OPC_DCLZ = 0x24 | OPC_SPECIAL2,
OPC_DCLO = 0x25 | OPC_SPECIAL2,
/* MXU */
+ OPC_MXU_D16MUL = 0x08 | OPC_SPECIAL2,
OPC_MXU_S8LDD = 0x22 | OPC_SPECIAL2,
OPC_MXU_S32I2M = 0x2F | OPC_SPECIAL2,
OPC_MXU_S32M2I = 0x2E | OPC_SPECIAL2,
@@ -3794,15 +3795,28 @@ typedef union {
uint32_t rb:5;
uint32_t special2:6;
} S8LDD;
+
+ struct {
+ uint32_t op:6;
+ uint32_t xra:4;
+ uint32_t xrb:4;
+ uint32_t xrc:4;
+ uint32_t xrd:4;
+ uint32_t optn2:2;
+ uint32_t sel:2;
+ uint32_t special2:6;
+ } D16MUL;
} MXU_OPCODE;
/* MXU Instructions */
static void gen_mxu(DisasContext *ctx, uint32_t opc)
{
#ifndef TARGET_MIPS64 /* Only works in 32 bit mode */
- TCGv t0, t1;
+ TCGv t0, t1, t2, t3;
t0 = tcg_temp_new();
t1 = tcg_temp_new();
+ t2 = tcg_temp_new();
+ t3 = tcg_temp_new();
MXU_OPCODE *opcode = (MXU_OPCODE *)&ctx->opcode;
switch (opc) {
@@ -3882,10 +3896,48 @@ static void gen_mxu(DisasContext *ctx, uint32_t opc)
}
gen_store_mxu_gpr(t0, opcode->S8LDD.xra);
break;
+
+ case OPC_MXU_D16MUL:
+ if (opcode->D16MUL.sel == 1) {
+ /* D16MULE is not supported */
+ generate_exception_end(ctx, EXCP_RI);
+ }
+ gen_load_mxu_gpr(t1, opcode->D16MUL.xrb);
+ tcg_gen_ext16s_tl(t0, t1);
+ tcg_gen_shri_tl(t1, t1, 16);
+ tcg_gen_ext16s_tl(t1, t1);
+ gen_load_mxu_gpr(t3, opcode->D16MUL.xrc);
+ tcg_gen_ext16s_tl(t2, t3);
+ tcg_gen_shri_tl(t3, t3, 16);
+ tcg_gen_ext16s_tl(t3, t3);
+
+ switch (opcode->D16MUL.optn2) {
+ case 0: /* XRB.H*XRC.H == lop, XRB.L*XRC.L == rop */
+ tcg_gen_mul_tl(t3, t1, t3);
+ tcg_gen_mul_tl(t2, t0, t2);
+ break;
+ case 1: /* XRB.L*XRC.H == lop, XRB.L*XRC.L == rop */
+ tcg_gen_mul_tl(t3, t0, t3);
+ tcg_gen_mul_tl(t2, t0, t2);
+ break;
+ case 2: /* XRB.H*XRC.H == lop, XRB.H*XRC.L == rop */
+ tcg_gen_mul_tl(t3, t1, t3);
+ tcg_gen_mul_tl(t2, t1, t2);
+ break;
+ case 3: /* XRB.L*XRC.H == lop, XRB.H*XRC.L == rop */
+ tcg_gen_mul_tl(t3, t0, t3);
+ tcg_gen_mul_tl(t2, t1, t2);
+ break;
+ }
+ gen_store_mxu_gpr(t3, opcode->D16MUL.xra);
+ gen_store_mxu_gpr(t2, opcode->D16MUL.xrd);
+ break;
}
tcg_temp_free(t0);
tcg_temp_free(t1);
+ tcg_temp_free(t2);
+ tcg_temp_free(t3);
#else
generate_exception_end(ctx, EXCP_RI);
#endif
@@ -17975,6 +18027,7 @@ static void decode_opc_special2_legacy(CPUMIPSState
*env, DisasContext *ctx)
case OPC_MXU_S32I2M:
case OPC_MXU_S32M2I:
case OPC_MXU_S8LDD:
+ case OPC_MXU_D16MUL:
gen_mxu(ctx, op1);
break;
--
2.18.0
- [Qemu-devel] [PATCH 0/7] Add limited MXU instruction support, Craig Janeczek, 2018/08/24
- [Qemu-devel] [PATCH 6/7] target/mips: Add MXU instructions Q8MUL and Q8MULSU, Craig Janeczek, 2018/08/24
- [Qemu-devel] [PATCH 2/7] target/mips: Add MXU instructions S32I2M and S32M2I, Craig Janeczek, 2018/08/24
- [Qemu-devel] [PATCH 1/7] target/mips: Add MXU register support, Craig Janeczek, 2018/08/24
- [Qemu-devel] [PATCH 4/7] target/mips: Add MXU instruction D16MUL,
Craig Janeczek <=
- [Qemu-devel] [PATCH 3/7] target/mips: Add MXU instruction S8LDD, Craig Janeczek, 2018/08/24
- [Qemu-devel] [PATCH 7/7] target/mips: Add MXU instructions S32LDD and S32LDDR, Craig Janeczek, 2018/08/24
- [Qemu-devel] [PATCH 5/7] target/mips: Add MXU instruction D16MAC, Craig Janeczek, 2018/08/24