[Qemu-ppc] [RFC v1 11/13] target-ppc: add maddld instruction

[Nikunj A Dadhania]

maddld: Multiply-Add Low Doubleword

Multiplies two 64-bit registers (RA * RB), adds third register(RC) to
the result(quadword) and returns the lower dword in the target
register(RT).

Signed-off-by: Nikunj A Dadhania <address@hidden>
---
 target-ppc/translate.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 9464942..9717048 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -7760,6 +7760,33 @@ GEN_VAFORM_PAIRED(vmsumshm, vmsumshs, 20)
 GEN_VAFORM_PAIRED(vsel, vperm, 21)
 GEN_VAFORM_PAIRED(vmaddfp, vnmsubfp, 23)
 
+#if defined(TARGET_PPC64)
+static void gen_maddld(DisasContext *ctx)
+{
+    TCGv_i64 lo = tcg_temp_new_i64();
+    TCGv_i64 hi = tcg_temp_new_i64();
+    TCGv_i64 t1 = tcg_temp_new_i64();
+    TCGv_i64 t2 = tcg_temp_new_i64();
+    TCGv_i64 zero = tcg_const_i64(0);
+    TCGv_i64 neg = tcg_const_i64(-1);
+
+    if (Rc(ctx->opcode)) {
+        tcg_gen_muls2_i64(lo, hi, cpu_gpr[rA(ctx->opcode)],
+                          cpu_gpr[rB(ctx->opcode)]);
+        tcg_gen_movi_i64(t2, -1);
+        tcg_gen_movcond_i64(TCG_COND_GE, t2, cpu_gpr[rC(ctx->opcode)], zero, 
zero, neg);
+    }
+    tcg_gen_mov_i64(t1, zero);
+    tcg_gen_add2_i64(cpu_gpr[rD(ctx->opcode)], t1, lo, hi, 
cpu_gpr[rC(ctx->opcode)], t2);
+    tcg_temp_free_i64(lo);
+    tcg_temp_free_i64(hi);
+    tcg_temp_free_i64(t1);
+    tcg_temp_free_i64(t2);
+    tcg_temp_free_i64(zero);
+    tcg_temp_free_i64(neg);
+}
+#endif /* defined(TARGET_PPC64) */
+
 GEN_VXFORM_NOA(vclzb, 1, 28)
 GEN_VXFORM_NOA(vclzh, 1, 29)
 GEN_VXFORM_NOA(vclzw, 1, 30)
@@ -10373,6 +10400,9 @@ GEN_HANDLER(lvsr, 0x1f, 0x06, 0x01, 0x00000001, 
PPC_ALTIVEC),
 GEN_HANDLER(mfvscr, 0x04, 0x2, 0x18, 0x001ff800, PPC_ALTIVEC),
 GEN_HANDLER(mtvscr, 0x04, 0x2, 0x19, 0x03ff0000, PPC_ALTIVEC),
 GEN_HANDLER(vmladduhm, 0x04, 0x11, 0xFF, 0x00000000, PPC_ALTIVEC),
+#if defined(TARGET_PPC64)
+GEN_HANDLER_E(maddld, 0x04, 0x19, 0xFF, 0x00000000, PPC_NONE, PPC2_ISA300),
+#endif
 GEN_HANDLER2(evsel0, "evsel", 0x04, 0x1c, 0x09, 0x00000000, PPC_SPE),
 GEN_HANDLER2(evsel1, "evsel", 0x04, 0x1d, 0x09, 0x00000000, PPC_SPE),
 GEN_HANDLER2(evsel2, "evsel", 0x04, 0x1e, 0x09, 0x00000000, PPC_SPE),
-- 
2.7.4