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

This patch addes the Unsigned 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>
qemu · Mar 5, 2014 · 6a4fda3 · 6a4fda3
1 parent e44259b
commit 6a4fda3
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diff --git a/target-ppc/helper.h b/target-ppc/helper.h
@@ -34,6 +34,7 @@ DEF_HELPER_3(mulldo, i64, env, i64, i64)
 DEF_HELPER_4(divdeu, i64, env, i64, i64, i32)
 DEF_HELPER_4(divde, i64, env, i64, i64, i32)
 #endif
+DEF_HELPER_4(divweu, 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)

diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
@@ -41,6 +41,37 @@ uint64_t helper_mulldo(CPUPPCState *env, uint64_t arg1, uint64_t arg2)
 }
 #endif
 
+target_ulong helper_divweu(CPUPPCState *env, target_ulong ra, target_ulong rb,
+                           uint32_t oe)
+{
+    uint64_t rt = 0;
+    int overflow = 0;
+
+    uint64_t dividend = (uint64_t)ra << 32;
+    uint64_t divisor = (uint32_t)rb;
+
+    if (unlikely(divisor == 0)) {
+        overflow = 1;
+    } else {
+        rt = dividend / divisor;
+        overflow = rt > UINT32_MAX;
+    }
+
+    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)

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
@@ -998,6 +998,9 @@ static void gen_##name(DisasContext *ctx)                                     \
     }                                                                         \
 }
 
+GEN_DIVE(divweu, divweu, 0);
+GEN_DIVE(divweuo, divweu, 1);
+
 #if defined(TARGET_PPC64)
 static inline void gen_op_arith_divd(DisasContext *ctx, TCGv ret, TCGv arg1,
                                      TCGv arg2, int sign, int compute_ov)
@@ -9716,6 +9719,8 @@ GEN_INT_ARITH_DIVW(divwu, 0x0E, 0, 0),
 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(divweu, 0x1F, 0x0B, 0x0C, 0, PPC_NONE, PPC2_DIVE_ISA206),
+GEN_HANDLER_E(divweuo, 0x1F, 0x0B, 0x1C, 0, PPC_NONE, PPC2_DIVE_ISA206),
 
 #if defined(TARGET_PPC64)
 #undef GEN_INT_ARITH_DIVD