[PATCH v2 1/3] target/ppc: Implement Vector Expand Mask

[matheus . ferst]

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

Implement the following PowerISA v3.1 instructions:
vexpandbm: Vector Expand Byte Mask
vexpandhm: Vector Expand Halfword Mask
vexpandwm: Vector Expand Word Mask
vexpanddm: Vector Expand Doubleword Mask
vexpandqm: Vector Expand Quadword Mask

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
---
 target/ppc/insn32.decode            | 11 ++++++++++
 target/ppc/translate/vmx-impl.c.inc | 34 +++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index e135b8aba4..9a28f1d266 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -56,6 +56,9 @@
 &VX_uim4        vrt uim vrb
 @VX_uim4        ...... vrt:5 . uim:4 vrb:5 ...........  &VX_uim4
 
+&VX_tb          vrt vrb
+@VX_tb          ...... vrt:5 ..... vrb:5 ...........    &VX_tb
+
 &X              rt ra rb
 @X              ...... rt:5 ra:5 rb:5 .......... .      &X
 
@@ -408,6 +411,14 @@ VINSWVRX        000100 ..... ..... ..... 00110001111    @VX
 VSLDBI          000100 ..... ..... ..... 00 ... 010110  @VN
 VSRDBI          000100 ..... ..... ..... 01 ... 010110  @VN
 
+## Vector Mask Manipulation Instructions
+
+VEXPANDBM       000100 ..... 00000 ..... 11001000010    @VX_tb
+VEXPANDHM       000100 ..... 00001 ..... 11001000010    @VX_tb
+VEXPANDWM       000100 ..... 00010 ..... 11001000010    @VX_tb
+VEXPANDDM       000100 ..... 00011 ..... 11001000010    @VX_tb
+VEXPANDQM       000100 ..... 00100 ..... 11001000010    @VX_tb
+
 # 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 b361f73a67..58aca58f0f 100644
--- a/target/ppc/translate/vmx-impl.c.inc
+++ b/target/ppc/translate/vmx-impl.c.inc
@@ -1505,6 +1505,40 @@ static bool trans_VSRDBI(DisasContext *ctx, arg_VN *a)
     return true;
 }
 
+static bool do_vexpand(DisasContext *ctx, arg_VX_tb *a, unsigned vece)
+{
+    REQUIRE_INSNS_FLAGS2(ctx, ISA310);
+    REQUIRE_VECTOR(ctx);
+
+    tcg_gen_gvec_sari(vece, avr_full_offset(a->vrt), avr_full_offset(a->vrb),
+                      (8 << vece) - 1, 16, 16);
+
+    return true;
+}
+
+TRANS(VEXPANDBM, do_vexpand, MO_8)
+TRANS(VEXPANDHM, do_vexpand, MO_16)
+TRANS(VEXPANDWM, do_vexpand, MO_32)
+TRANS(VEXPANDDM, do_vexpand, MO_64)
+
+static bool trans_VEXPANDQM(DisasContext *ctx, arg_VX_tb *a)
+{
+    TCGv_i64 tmp;
+
+    REQUIRE_INSNS_FLAGS2(ctx, ISA310);
+    REQUIRE_VECTOR(ctx);
+
+    tmp = tcg_temp_new_i64();
+
+    get_avr64(tmp, a->vrb, true);
+    tcg_gen_sari_i64(tmp, tmp, 63);
+    set_avr64(a->vrt, tmp, false);
+    set_avr64(a->vrt, tmp, true);
+
+    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