[Qemu-devel] [PULL 13/19] target/ppc: Refactor emulation of vmrgew and vmrgow instructions

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

From: Stefan Brankovic <stefan.brankovic@rt-rk.com>

Since I found this two instructions implemented with tcg, I refactored
them so they are consistent with other similar implementations that
I introduced in this patch.

Also, a new dual macro GEN_VXFORM_TRANS_DUAL is added. This macro is
used if one instruction is realized with direct translation, and second
one with a helper.

Signed-off-by: Stefan Brankovic <stefan.brankovic@rt-rk.com>
Message-Id: <1566898663-25858-4-git-send-email-stefan.brankovic@rt-rk.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 target/ppc/translate/vmx-impl.inc.c | 66 ++++++++++++++++-------------
 1 file changed, 37 insertions(+), 29 deletions(-)

diff --git a/target/ppc/translate/vmx-impl.inc.c b/target/ppc/translate/vmx-impl.inc.c
index 0d71c10428..2472a5217a 100644
--- a/target/ppc/translate/vmx-impl.inc.c
+++ b/target/ppc/translate/vmx-impl.inc.c
@@ -350,6 +350,28 @@ static void glue(gen_, name0##_##name1)(DisasContext *ctx)             \
     }                                                                  \
 }
 
+/*
+ * We use this macro if one instruction is realized with direct
+ * translation, and second one with helper.
+ */
+#define GEN_VXFORM_TRANS_DUAL(name0, flg0, flg2_0, name1, flg1, flg2_1)\
+static void glue(gen_, name0##_##name1)(DisasContext *ctx)             \
+{                                                                      \
+    if ((Rc(ctx->opcode) == 0) &&                                      \
+        ((ctx->insns_flags & flg0) || (ctx->insns_flags2 & flg2_0))) { \
+        if (unlikely(!ctx->altivec_enabled)) {                         \
+            gen_exception(ctx, POWERPC_EXCP_VPU);                      \
+            return;                                                    \
+        }                                                              \
+        trans_##name0(ctx);                                            \
+    } else if ((Rc(ctx->opcode) == 1) &&                               \
+        ((ctx->insns_flags & flg1) || (ctx->insns_flags2 & flg2_1))) { \
+        gen_##name1(ctx);                                              \
+    } else {                                                           \
+        gen_inval_exception(ctx, POWERPC_EXCP_INVAL_INVAL);            \
+    }                                                                  \
+}
+
 /* Adds support to provide invalid mask */
 #define GEN_VXFORM_DUAL_EXT(name0, flg0, flg2_0, inval0,                \
                             name1, flg1, flg2_1, inval1)                \
@@ -431,20 +453,13 @@ GEN_VXFORM(vmrglb, 6, 4);
 GEN_VXFORM(vmrglh, 6, 5);
 GEN_VXFORM(vmrglw, 6, 6);
 
-static void gen_vmrgew(DisasContext *ctx)
+static void trans_vmrgew(DisasContext *ctx)
 {
-    TCGv_i64 tmp;
-    TCGv_i64 avr;
-    int VT, VA, VB;
-    if (unlikely(!ctx->altivec_enabled)) {
-        gen_exception(ctx, POWERPC_EXCP_VPU);
-        return;
-    }
-    VT = rD(ctx->opcode);
-    VA = rA(ctx->opcode);
-    VB = rB(ctx->opcode);
-    tmp = tcg_temp_new_i64();
-    avr = tcg_temp_new_i64();
+    int VT = rD(ctx->opcode);
+    int VA = rA(ctx->opcode);
+    int VB = rB(ctx->opcode);
+    TCGv_i64 tmp = tcg_temp_new_i64();
+    TCGv_i64 avr = tcg_temp_new_i64();
 
     get_avr64(avr, VB, true);
     tcg_gen_shri_i64(tmp, avr, 32);
@@ -462,21 +477,14 @@ static void gen_vmrgew(DisasContext *ctx)
     tcg_temp_free_i64(avr);
 }
 
-static void gen_vmrgow(DisasContext *ctx)
+static void trans_vmrgow(DisasContext *ctx)
 {
-    TCGv_i64 t0, t1;
-    TCGv_i64 avr;
-    int VT, VA, VB;
-    if (unlikely(!ctx->altivec_enabled)) {
-        gen_exception(ctx, POWERPC_EXCP_VPU);
-        return;
-    }
-    VT = rD(ctx->opcode);
-    VA = rA(ctx->opcode);
-    VB = rB(ctx->opcode);
-    t0 = tcg_temp_new_i64();
-    t1 = tcg_temp_new_i64();
-    avr = tcg_temp_new_i64();
+    int VT = rD(ctx->opcode);
+    int VA = rA(ctx->opcode);
+    int VB = rB(ctx->opcode);
+    TCGv_i64 t0 = tcg_temp_new_i64();
+    TCGv_i64 t1 = tcg_temp_new_i64();
+    TCGv_i64 avr = tcg_temp_new_i64();
 
     get_avr64(t0, VB, true);
     get_avr64(t1, VA, true);
@@ -936,14 +944,14 @@ GEN_VXFORM_ENV(vminfp, 5, 17);
 GEN_VXFORM_HETRO(vextublx, 6, 24)
 GEN_VXFORM_HETRO(vextuhlx, 6, 25)
 GEN_VXFORM_HETRO(vextuwlx, 6, 26)
-GEN_VXFORM_DUAL(vmrgow, PPC_NONE, PPC2_ALTIVEC_207,
+GEN_VXFORM_TRANS_DUAL(vmrgow, PPC_NONE, PPC2_ALTIVEC_207,
                 vextuwlx, PPC_NONE, PPC2_ISA300)
 GEN_VXFORM_HETRO(vextubrx, 6, 28)
 GEN_VXFORM_HETRO(vextuhrx, 6, 29)
 GEN_VXFORM_HETRO(vextuwrx, 6, 30)
 GEN_VXFORM_TRANS(lvsl, 6, 31)
 GEN_VXFORM_TRANS(lvsr, 6, 32)
-GEN_VXFORM_DUAL(vmrgew, PPC_NONE, PPC2_ALTIVEC_207, \
+GEN_VXFORM_TRANS_DUAL(vmrgew, PPC_NONE, PPC2_ALTIVEC_207,
                 vextuwrx, PPC_NONE, PPC2_ISA300)
 
 #define GEN_VXRFORM1(opname, name, str, opc2, opc3)                     \
-- 
2.21.0