target/ppc: Use TCG_CALL_NO_RWG_SE in fsel helper

fsel doesn't change FPSCR and CR1 is handled by gen_set_cr1_from_fpscr,
so helper_fsel doesn't need the env argument and can be declared with
TCG_CALL_NO_RWG_SE. We also take this opportunity to move the insn to
decodetree.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220517123929.284511-6-matheus.ferst@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

5 files changed, 43 insertions, 12 deletions

diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index 8592727..5884487 100644
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -919,18 +919,17 @@ float64 helper_frsqrtes(CPUPPCState *env, float64 arg)
 }
 
 /* fsel - fsel. */
-uint64_t helper_fsel(CPUPPCState *env, uint64_t arg1, uint64_t arg2,
-                     uint64_t arg3)
+uint64_t helper_FSEL(uint64_t a, uint64_t b, uint64_t c)
 {
-    CPU_DoubleU farg1;
+    CPU_DoubleU fa;
 
-    farg1.ll = arg1;
+    fa.ll = a;
 
-    if ((!float64_is_neg(farg1.d) || float64_is_zero(farg1.d)) &&
-        !float64_is_any_nan(farg1.d)) {
-        return arg2;
+    if ((!float64_is_neg(fa.d) || float64_is_zero(fa.d)) &&
+        !float64_is_any_nan(fa.d)) {
+        return c;
     } else {
-        return arg3;
+        return b;
     }
 }
 
diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index f82c5bd..ddfa030 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -120,7 +120,7 @@ DEF_HELPER_2(fre, i64, env, i64)
 DEF_HELPER_2(fres, i64, env, i64)
 DEF_HELPER_2(frsqrte, i64, env, i64)
 DEF_HELPER_2(frsqrtes, i64, env, i64)
-DEF_HELPER_4(fsel, i64, env, i64, i64, i64)
+DEF_HELPER_FLAGS_3(FSEL, TCG_CALL_NO_RWG_SE, i64, i64, i64, i64)
 
 DEF_HELPER_FLAGS_2(ftdiv, TCG_CALL_NO_RWG_SE, i32, i64, i64)
 DEF_HELPER_FLAGS_1(ftsqrt, TCG_CALL_NO_RWG_SE, i32, i64)
diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index 39372fe..1d0b55b 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -17,6 +17,9 @@
 # License along with this library; if not, see <http://www.gnu.org/licenses/>.
 #
 
+&A              frt fra frb frc rc:bool
+@A              ...... frt:5 fra:5 frb:5 frc:5 ..... rc:1       &A
+
 &D              rt ra si:int64_t
 @D              ...... rt:5 ra:5 si:s16                 &D
 
@@ -308,6 +311,10 @@ STFDU           110111 ..... ...... ...............     @D
 STFDX           011111 ..... ...... .... 1011010111 -   @X
 STFDUX          011111 ..... ...... .... 1011110111 -   @X
 
+### Floating-Point Select Instruction
+
+FSEL            111111 ..... ..... ..... ..... 10111 .  @A
+
 ### Move To/From System Register Instructions
 
 SETBC           011111 ..... ..... ----- 0110000000 -   @X_bi
diff --git a/target/ppc/translate/fp-impl.c.inc b/target/ppc/translate/fp-impl.c.inc
index cfb27bd..f9b58b8 100644
--- a/target/ppc/translate/fp-impl.c.inc
+++ b/target/ppc/translate/fp-impl.c.inc
@@ -222,8 +222,34 @@ static void gen_frsqrtes(DisasContext *ctx)
     tcg_temp_free_i64(t1);
 }
 
-/* fsel */
-_GEN_FLOAT_ACB(sel, 0x3F, 0x17, 0, PPC_FLOAT_FSEL);
+static bool trans_FSEL(DisasContext *ctx, arg_A *a)
+{
+    TCGv_i64 t0, t1, t2;
+
+    REQUIRE_INSNS_FLAGS(ctx, FLOAT_FSEL);
+    REQUIRE_FPU(ctx);
+
+    t0 = tcg_temp_new_i64();
+    t1 = tcg_temp_new_i64();
+    t2 = tcg_temp_new_i64();
+
+    get_fpr(t0, a->fra);
+    get_fpr(t1, a->frb);
+    get_fpr(t2, a->frc);
+
+    gen_helper_FSEL(t0, t0, t1, t2);
+    set_fpr(a->frt, t0);
+    if (a->rc) {
+        gen_set_cr1_from_fpscr(ctx);
+    }
+
+    tcg_temp_free_i64(t0);
+    tcg_temp_free_i64(t1);
+    tcg_temp_free_i64(t2);
+
+    return true;
+}
+
 /* fsub - fsubs */
 GEN_FLOAT_AB(sub, 0x14, 0x000007C0, 1, PPC_FLOAT);
 /* Optional: */
diff --git a/target/ppc/translate/fp-ops.c.inc b/target/ppc/translate/fp-ops.c.inc
index 4260635..0538ab2 100644
--- a/target/ppc/translate/fp-ops.c.inc
+++ b/target/ppc/translate/fp-ops.c.inc
@@ -24,7 +24,6 @@ GEN_FLOAT_AC(mul, 0x19, 0x0000F800, 1, PPC_FLOAT),
 GEN_FLOAT_BS(re, 0x3F, 0x18, 1, PPC_FLOAT_EXT),
 GEN_FLOAT_BS(res, 0x3B, 0x18, 1, PPC_FLOAT_FRES),
 GEN_FLOAT_BS(rsqrte, 0x3F, 0x1A, 1, PPC_FLOAT_FRSQRTE),
-_GEN_FLOAT_ACB(sel, sel, 0x3F, 0x17, 0, 0, PPC_FLOAT_FSEL),
 GEN_FLOAT_AB(sub, 0x14, 0x000007C0, 1, PPC_FLOAT),
 GEN_FLOAT_ACB(madd, 0x1D, 1, PPC_FLOAT),
 GEN_FLOAT_ACB(msub, 0x1C, 1, PPC_FLOAT),