target-ppc: Add ISA 2.06 divwe[o] Instructions

This patch addes the signed Divide Word Extended instructions
which were introduced in Power ISA 2.06B.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>

target-ppc/helper.h

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 52e49f1..cbff496 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -35,6 +35,7 @@
 DEF_HELPER_4(divde, i64, env, i64, i64, i32)
 #endif
 DEF_HELPER_4(divweu, tl, env, tl, tl, i32)
+DEF_HELPER_4(divwe, tl, env, tl, tl, i32)
 
 DEF_HELPER_FLAGS_1(cntlzw, TCG_CALL_NO_RWG_SE, tl, tl)
 DEF_HELPER_FLAGS_1(popcntb, TCG_CALL_NO_RWG_SE, tl, tl)

target-ppc/int_helper.c

diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
index 45586be..71db3fb 100644
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -72,6 +72,38 @@
     return (target_ulong)rt;
 }
 
+target_ulong helper_divwe(CPUPPCState *env, target_ulong ra, target_ulong rb,
+                          uint32_t oe)
+{
+    int64_t rt = 0;
+    int overflow = 0;
+
+    int64_t dividend = (int64_t)ra << 32;
+    int64_t divisor = (int64_t)((int32_t)rb);
+
+    if (unlikely((divisor == 0) ||
+                 ((divisor == -1ull) && (dividend == INT64_MIN)))) {
+        overflow = 1;
+    } else {
+        rt = dividend / divisor;
+        overflow = rt != (int32_t)rt;
+    }
+
+    if (unlikely(overflow)) {
+        rt = 0; /* Undefined */
+    }
+
+    if (oe) {
+        if (unlikely(overflow)) {
+            env->so = env->ov = 1;
+        } else {
+            env->ov = 0;
+        }
+    }
+
+    return (target_ulong)rt;
+}
+
 #if defined(TARGET_PPC64)
 
 uint64_t helper_divdeu(CPUPPCState *env, uint64_t ra, uint64_t rb, uint32_t oe)

target-ppc/translate.c

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index e361d49..fed957e 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -1000,6 +1000,8 @@
 
 GEN_DIVE(divweu, divweu, 0);
 GEN_DIVE(divweuo, divweu, 1);
+GEN_DIVE(divwe, divwe, 0);
+GEN_DIVE(divweo, divwe, 1);
 
 #if defined(TARGET_PPC64)
 static inline void gen_op_arith_divd(DisasContext *ctx, TCGv ret, TCGv arg1,
@@ -9719,6 +9721,8 @@
 GEN_INT_ARITH_DIVW(divwuo, 0x1E, 0, 1),
 GEN_INT_ARITH_DIVW(divw, 0x0F, 1, 0),
 GEN_INT_ARITH_DIVW(divwo, 0x1F, 1, 1),
+GEN_HANDLER_E(divwe, 0x1F, 0x0B, 0x0D, 0, PPC_NONE, PPC2_DIVE_ISA206),
+GEN_HANDLER_E(divweo, 0x1F, 0x0B, 0x1D, 0, PPC_NONE, PPC2_DIVE_ISA206),
 GEN_HANDLER_E(divweu, 0x1F, 0x0B, 0x0C, 0, PPC_NONE, PPC2_DIVE_ISA206),
 GEN_HANDLER_E(divweuo, 0x1F, 0x0B, 0x1C, 0, PPC_NONE, PPC2_DIVE_ISA206),