[PULL 37/42] target/ppc: Implement setbc/setbcr/stnbc/setnbcr instructions

[David Gibson <david@gibson.dropbear.id.au>]

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

Implements the following PowerISA v3.1 instructions:
setbc: Set Boolean Condition
setbcr: Set Boolean Condition Reverse
setnbc: Set Negative Boolean Condition
setnbcr: Set Negative Boolean Condition Reverse

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20210601193528.2533031-11-matheus.ferst@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 target/ppc/insn32.decode                   | 10 ++++++++++
 target/ppc/translate/fixedpoint-impl.c.inc | 23 ++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index 00ec0f4328..bc69c70493 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -26,6 +26,9 @@
 &X              rt ra rb
 @X              ...... rt:5 ra:5 rb:5 .......... .      &X
 
+&X_bi           rt bi
+@X_bi           ...... rt:5 bi:5 ----- .......... -     &X_bi
+
 ### Fixed-Point Load Instructions
 
 LBZ             100010 ..... ..... ................     @D
@@ -83,3 +86,10 @@ STDUX           011111 ..... ..... ..... 0010110101 -   @X
 
 ADDI            001110 ..... ..... ................     @D
 ADDIS           001111 ..... ..... ................     @D
+
+### Move To/From System Register Instructions
+
+SETBC           011111 ..... ..... ----- 0110000000 -   @X_bi
+SETBCR          011111 ..... ..... ----- 0110100000 -   @X_bi
+SETNBC          011111 ..... ..... ----- 0111000000 -   @X_bi
+SETNBCR         011111 ..... ..... ----- 0111100000 -   @X_bi
diff --git a/target/ppc/translate/fixedpoint-impl.c.inc b/target/ppc/translate/fixedpoint-impl.c.inc
index 2d2d874146..5f9845fa40 100644
--- a/target/ppc/translate/fixedpoint-impl.c.inc
+++ b/target/ppc/translate/fixedpoint-impl.c.inc
@@ -204,3 +204,26 @@ static bool trans_PNOP(DisasContext *ctx, arg_PNOP *a)
 {
     return true;
 }
+
+static bool do_set_bool_cond(DisasContext *ctx, arg_X_bi *a, bool neg, bool rev)
+{
+    REQUIRE_INSNS_FLAGS2(ctx, ISA310);
+    uint32_t mask = 0x08 >> (a->bi & 0x03);
+    TCGCond cond = rev ? TCG_COND_EQ : TCG_COND_NE;
+    TCGv temp = tcg_temp_new();
+
+    tcg_gen_extu_i32_tl(temp, cpu_crf[a->bi >> 2]);
+    tcg_gen_andi_tl(temp, temp, mask);
+    tcg_gen_setcondi_tl(cond, cpu_gpr[a->rt], temp, 0);
+    if (neg) {
+        tcg_gen_neg_tl(cpu_gpr[a->rt], cpu_gpr[a->rt]);
+    }
+    tcg_temp_free(temp);
+
+    return true;
+}
+
+TRANS(SETBC, do_set_bool_cond, false, false)
+TRANS(SETBCR, do_set_bool_cond, false, true)
+TRANS(SETNBC, do_set_bool_cond, true, false)
+TRANS(SETNBCR, do_set_bool_cond, true, true)
-- 
2.31.1