[PATCH v4 15/47] target/ppc: implement vclrlb

[matheus . ferst]

From: Matheus Ferst <matheus.ferst@eldorado.org.br>

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
---
v4:
 - Branchless implementation (rth)
---
 target/ppc/insn32.decode            |  2 ++
 target/ppc/translate/vmx-impl.c.inc | 40 +++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index d844d86829..31cdbba86b 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -529,6 +529,8 @@ VSTRIBR         000100 ..... 00001 ..... . 0000001101   
@VX_tb_rc
 VSTRIHL         000100 ..... 00010 ..... . 0000001101   @VX_tb_rc
 VSTRIHR         000100 ..... 00011 ..... . 0000001101   @VX_tb_rc
 
+VCLRLB          000100 ..... ..... ..... 00110001101    @VX
+
 # VSX Load/Store Instructions
 
 LXV             111101 ..... ..... ............ . 001   @DQ_TSX
diff --git a/target/ppc/translate/vmx-impl.c.inc 
b/target/ppc/translate/vmx-impl.c.inc
index 1a69931d36..8f12d78071 100644
--- a/target/ppc/translate/vmx-impl.c.inc
+++ b/target/ppc/translate/vmx-impl.c.inc
@@ -1940,6 +1940,46 @@ TRANS(VSTRIBR, do_vstri, gen_helper_VSTRIBR)
 TRANS(VSTRIHL, do_vstri, gen_helper_VSTRIHL)
 TRANS(VSTRIHR, do_vstri, gen_helper_VSTRIHR)
 
+static bool trans_VCLRLB(DisasContext *ctx, arg_VX *a)
+{
+    TCGv_i64 rb, mh, ml, tmp,
+             ones = tcg_constant_i64(-1),
+             zero = tcg_constant_i64(0);
+
+    rb = tcg_temp_new_i64();
+    mh = tcg_temp_new_i64();
+    ml = tcg_temp_new_i64();
+    tmp = tcg_temp_new_i64();
+
+    tcg_gen_extu_tl_i64(rb, cpu_gpr[a->vrb]);
+    tcg_gen_andi_i64(tmp, rb, 7);
+    tcg_gen_shli_i64(tmp, tmp, 3);
+    tcg_gen_shl_i64(tmp, tcg_constant_i64(-1), tmp);
+    tcg_gen_not_i64(tmp, tmp);
+
+    tcg_gen_movcond_i64(TCG_COND_LTU, ml, rb, tcg_constant_i64(8),
+                        tmp, ones);
+    tcg_gen_movcond_i64(TCG_COND_LTU, mh, rb, tcg_constant_i64(8),
+                        zero, tmp);
+    tcg_gen_movcond_i64(TCG_COND_LTU, mh, rb, tcg_constant_i64(16),
+                        mh, ones);
+
+    get_avr64(tmp, a->vra, true);
+    tcg_gen_and_i64(tmp, tmp, mh);
+    set_avr64(a->vrt, tmp, true);
+
+    get_avr64(tmp, a->vra, false);
+    tcg_gen_and_i64(tmp, tmp, ml);
+    set_avr64(a->vrt, tmp, false);
+
+    tcg_temp_free_i64(rb);
+    tcg_temp_free_i64(mh);
+    tcg_temp_free_i64(ml);
+    tcg_temp_free_i64(tmp);
+
+    return true;
+}
+
 #define GEN_VAFORM_PAIRED(name0, name1, opc2)                           \
 static void glue(gen_, name0##_##name1)(DisasContext *ctx)              \
     {                                                                   \
-- 
2.25.1