Adds support for emulating the D16MUL instruction.
Signed-off-by: Craig Janeczek <jancr...@amazon.com>
---
v1
- initial patch
v2
- changed bitfield usage to extract32
- used sextract_tl instructions instead of shift and ext
v3
- Split gen_mxu function into command specific gen_mxu_<ins> functions
target/mips/translate.c | 55 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/target/mips/translate.c b/target/mips/translate.c
index 024e48baf6..f693e45203 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -3916,6 +3916,57 @@ static void gen_mxu_s8ldd(DisasContext *ctx, uint32_t
opc)
tcg_temp_free(t1);
}
+/* D16MUL XRa, XRb, XRc, XRd, OPTN2 - Signed 16 bit pattern multiplication */
+static void gen_mxu_d16mul(DisasContext *ctx, uint32_t opc)
+{
+ TCGv t0, t1, t2, t3;
+ uint32_t xra, xrb, xrc, xrd, optn2;
+
+ t0 = tcg_temp_new();
+ t1 = tcg_temp_new();
+ t2 = tcg_temp_new();
+ t3 = tcg_temp_new();
+
+ xra = extract32(ctx->opcode, 6, 4);
+ xrb = extract32(ctx->opcode, 10, 4);
+ xrc = extract32(ctx->opcode, 14, 4);
+ xrd = extract32(ctx->opcode, 18, 4);
+ optn2 = extract32(ctx->opcode, 22, 2);
+
+ gen_load_mxu_gpr(t1, xrb);
+ tcg_gen_sextract_tl(t0, t1, 0, 16);
+ tcg_gen_sextract_tl(t1, t1, 16, 16);
+ gen_load_mxu_gpr(t3, xrc);
+ tcg_gen_sextract_tl(t2, t3, 0, 16);
+ tcg_gen_sextract_tl(t3, t3, 16, 16);
+
+ switch (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, xra);
+ gen_store_mxu_gpr(t2, xrd);
+
+ tcg_temp_free(t0);
+ tcg_temp_free(t1);
+ tcg_temp_free(t2);
+ tcg_temp_free(t3);
+}
+
/* Godson integer instructions */
static void gen_loongson_integer(DisasContext *ctx, uint32_t opc,
int rd, int rs, int rt)
@@ -18025,6 +18076,10 @@ static void decode_opc_special2_legacy(CPUMIPSState
*env, DisasContext *ctx)
gen_mxu_s8ldd(ctx, op1);
break;
+ case OPC_MXU_D16MUL:
+ gen_mxu_d16mul(ctx, op1);
+ break;
+
case OPC_CLO:
case OPC_CLZ:
check_insn(ctx, ISA_MIPS32);
--
2.18.0
