[PULL 44/87] target/ppc: Implement xvtlsbb instruction

[Cédric Le Goater]

From: Víctor Colombo <victor.colombo@eldorado.org.br>

Signed-off-by: Víctor Colombo <victor.colombo@eldorado.org.br>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20220225210936.1749575-39-matheus.ferst@eldorado.org.br>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/insn32.decode            |  7 +++++
 target/ppc/translate/vsx-impl.c.inc | 40 +++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index c28cc13325fe..973cda113166 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -155,6 +155,9 @@
 &XX2            xt xb uim:uint8_t
 @XX2            ...... ..... ... uim:2 ..... ......... ..       &XX2 xt=%xx_xt 
xb=%xx_xb
 
+&XX2_bf_xb      bf xb
+@XX2_bf_xb      ...... bf:3 .. ..... ..... ......... . .        &XX2_bf_xb 
xb=%xx_xb
+
 &XX3            xt xa xb
 @XX3            ...... ..... ..... ..... ........ ...           &XX3 xt=%xx_xt 
xa=%xx_xa xb=%xx_xb
 
@@ -666,6 +669,10 @@ XSMINJDP        111100 ..... ..... ..... 10011000 ...   
@XX3
 
 XSCVQPDP        111111 ..... 10100 ..... 1101000100 .   @X_tb_rc
 
+## VSX Vector Test Least-Significant Bit by Byte Instruction
+
+XVTLSBB         111100 ... -- 00010 ..... 111011011 . - @XX2_bf_xb
+
 ### rfebb
 &XL_s           s:uint8_t
 @XL_s           ......-------------- s:1 .......... -   &XL_s
diff --git a/target/ppc/translate/vsx-impl.c.inc 
b/target/ppc/translate/vsx-impl.c.inc
index 292a14f5aa98..4da889531bd7 100644
--- a/target/ppc/translate/vsx-impl.c.inc
+++ b/target/ppc/translate/vsx-impl.c.inc
@@ -1704,6 +1704,46 @@ static bool trans_LXVKQ(DisasContext *ctx, arg_X_uim5 *a)
     return true;
 }
 
+static bool trans_XVTLSBB(DisasContext *ctx, arg_XX2_bf_xb *a)
+{
+    TCGv_i64 xb, t0, t1, all_true, all_false, mask, zero;
+
+    REQUIRE_INSNS_FLAGS2(ctx, ISA310);
+    REQUIRE_VSX(ctx);
+
+    xb = tcg_temp_new_i64();
+    t0 = tcg_temp_new_i64();
+    t1 = tcg_temp_new_i64();
+    all_true = tcg_temp_new_i64();
+    all_false = tcg_temp_new_i64();
+    mask = tcg_constant_i64(dup_const(MO_8, 1));
+    zero = tcg_constant_i64(0);
+
+    get_cpu_vsr(xb, a->xb, true);
+    tcg_gen_and_i64(t0, mask, xb);
+    get_cpu_vsr(xb, a->xb, false);
+    tcg_gen_and_i64(t1, mask, xb);
+
+    tcg_gen_or_i64(all_false, t0, t1);
+    tcg_gen_and_i64(all_true, t0, t1);
+
+    tcg_gen_setcond_i64(TCG_COND_EQ, all_false, all_false, zero);
+    tcg_gen_shli_i64(all_false, all_false, 1);
+    tcg_gen_setcond_i64(TCG_COND_EQ, all_true, all_true, mask);
+    tcg_gen_shli_i64(all_true, all_true, 3);
+
+    tcg_gen_or_i64(t0, all_false, all_true);
+    tcg_gen_extrl_i64_i32(cpu_crf[a->bf], t0);
+
+    tcg_temp_free_i64(xb);
+    tcg_temp_free_i64(t0);
+    tcg_temp_free_i64(t1);
+    tcg_temp_free_i64(all_true);
+    tcg_temp_free_i64(all_false);
+
+    return true;
+}
+
 static void gen_xxsldwi(DisasContext *ctx)
 {
     TCGv_i64 xth, xtl;
-- 
2.34.1