[Qemu-devel] [PATCH v4 09/15] target-ppc: add cnttzd[.] instruction

[Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>]

From: Sandipan Das <sandipandas1990@gmail.com>

Add ISA3.0 Count trailing zeros double word

Signed-off-by: Sandipan Das <sandipandas1990@gmail.com>
[ added ISA300 flag ]
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
---
 target-ppc/helper.h     |  1 +
 target-ppc/int_helper.c |  5 +++++
 target-ppc/translate.c  | 10 ++++++++++
 3 files changed, 16 insertions(+)

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 1f5cfd0..0c29c01 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -44,6 +44,7 @@ DEF_HELPER_FLAGS_2(cmpb, TCG_CALL_NO_RWG_SE, tl, tl, tl)
 DEF_HELPER_3(sraw, tl, env, tl, tl)
 #if defined(TARGET_PPC64)
 DEF_HELPER_FLAGS_1(cntlzd, TCG_CALL_NO_RWG_SE, tl, tl)
+DEF_HELPER_FLAGS_1(cnttzd, TCG_CALL_NO_RWG_SE, tl, tl)
 DEF_HELPER_FLAGS_1(popcntd, TCG_CALL_NO_RWG_SE, tl, tl)
 DEF_HELPER_FLAGS_2(bpermd, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_3(srad, tl, env, tl, tl)
diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
index 7445376..93e8dfa 100644
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -150,6 +150,11 @@ target_ulong helper_cntlzd(target_ulong t)
 {
     return clz64(t);
 }
+
+target_ulong helper_cnttzd(target_ulong t)
+{
+    return ctz64(t);
+}
 #endif
 
 #if defined(TARGET_PPC64)
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index ba22e13..038106d 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -1824,6 +1824,15 @@ static void gen_cntlzd(DisasContext *ctx)
     if (unlikely(Rc(ctx->opcode) != 0))
         gen_set_Rc0(ctx, cpu_gpr[rA(ctx->opcode)]);
 }
+
+/* cnttzd */
+static void gen_cnttzd(DisasContext *ctx)
+{
+    gen_helper_cnttzd(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rS(ctx->opcode)]);
+    if (unlikely(Rc(ctx->opcode) != 0)) {
+        gen_set_Rc0(ctx, cpu_gpr[rA(ctx->opcode)]);
+    }
+}
 #endif
 
 /***                             Integer rotate                            ***/
@@ -10061,6 +10070,7 @@ GEN_HANDLER_E(prtyw, 0x1F, 0x1A, 0x04, 0x0000F801, PPC_NONE, PPC2_ISA205),
 #if defined(TARGET_PPC64)
 GEN_HANDLER(popcntd, 0x1F, 0x1A, 0x0F, 0x0000F801, PPC_POPCNTWD),
 GEN_HANDLER(cntlzd, 0x1F, 0x1A, 0x01, 0x00000000, PPC_64B),
+GEN_HANDLER_E(cnttzd, 0x1F, 0x1A, 0x11, 0x00000000, PPC_NONE, PPC2_ISA300),
 GEN_HANDLER_E(prtyd, 0x1F, 0x1A, 0x05, 0x0000F801, PPC_NONE, PPC2_ISA205),
 GEN_HANDLER_E(bpermd, 0x1F, 0x1C, 0x07, 0x00000001, PPC_NONE, PPC2_PERM_ISA206),
 #endif
-- 
2.7.4