[Qemu-devel] [PATCH v2 5/8] target-arm: A64: Add logic ops from SIMD 3 same group

[Peter Maydell <peter.maydell@linaro.org>]

Add support for the logical operations (ORR, AND, BIC, ORN, EOR, BSL,
BIT and BIF) from the SIMD 3 register same group (C3.6.16).

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
---
 target-arm/translate-a64.c | 73 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 72 insertions(+), 1 deletion(-)

diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 2079c96..4767cbf 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -5951,7 +5951,78 @@ static void disas_simd_three_reg_diff(DisasContext *s, uint32_t insn)
 /* Logic op (opcode == 3) subgroup of C3.6.16. */
 static void disas_simd_3same_logic(DisasContext *s, uint32_t insn)
 {
-    unsupported_encoding(s, insn);
+    int rd = extract32(insn, 0, 5);
+    int rn = extract32(insn, 5, 5);
+    int rm = extract32(insn, 16, 5);
+    int size = extract32(insn, 22, 2);
+    bool is_u = extract32(insn, 29, 1);
+    bool is_q = extract32(insn, 30, 1);
+    TCGv_i64 tcg_op1 = tcg_temp_new_i64();
+    TCGv_i64 tcg_op2 = tcg_temp_new_i64();
+    TCGv_i64 tcg_res[2];
+    int pass;
+
+    tcg_res[0] = tcg_temp_new_i64();
+    tcg_res[1] = tcg_temp_new_i64();
+
+    for (pass = 0; pass < (is_q ? 2 : 1); pass++) {
+        read_vec_element(s, tcg_op1, rn, pass, MO_64);
+        read_vec_element(s, tcg_op2, rm, pass, MO_64);
+
+        if (!is_u) {
+            switch (size) {
+            case 0: /* AND */
+                tcg_gen_and_i64(tcg_res[pass], tcg_op1, tcg_op2);
+                break;
+            case 1: /* BIC */
+                tcg_gen_andc_i64(tcg_res[pass], tcg_op1, tcg_op2);
+                break;
+            case 2: /* ORR */
+                tcg_gen_or_i64(tcg_res[pass], tcg_op1, tcg_op2);
+                break;
+            case 3: /* ORN */
+                tcg_gen_orc_i64(tcg_res[pass], tcg_op1, tcg_op2);
+                break;
+            }
+        } else {
+            if (size != 0) {
+                /* B* ops need res loaded to operate on */
+                read_vec_element(s, tcg_res[pass], rd, pass, MO_64);
+            }
+
+            switch (size) {
+            case 0: /* EOR */
+                tcg_gen_xor_i64(tcg_res[pass], tcg_op1, tcg_op2);
+                break;
+            case 1: /* BSL bitwise select */
+                tcg_gen_xor_i64(tcg_op1, tcg_op1, tcg_op2);
+                tcg_gen_and_i64(tcg_op1, tcg_op1, tcg_res[pass]);
+                tcg_gen_xor_i64(tcg_res[pass], tcg_op2, tcg_op1);
+                break;
+            case 2: /* BIT, bitwise insert if true */
+                tcg_gen_xor_i64(tcg_op1, tcg_op1, tcg_res[pass]);
+                tcg_gen_and_i64(tcg_op1, tcg_op1, tcg_op2);
+                tcg_gen_xor_i64(tcg_res[pass], tcg_res[pass], tcg_op1);
+                break;
+            case 3: /* BIF, bitwise insert if false */
+                tcg_gen_xor_i64(tcg_op1, tcg_op1, tcg_res[pass]);
+                tcg_gen_andc_i64(tcg_op1, tcg_op1, tcg_op2);
+                tcg_gen_xor_i64(tcg_res[pass], tcg_res[pass], tcg_op1);
+                break;
+            }
+        }
+    }
+
+    write_vec_element(s, tcg_res[0], rd, 0, MO_64);
+    if (!is_q) {
+        tcg_gen_movi_i64(tcg_res[1], 0);
+    }
+    write_vec_element(s, tcg_res[1], rd, 1, MO_64);
+
+    tcg_temp_free_i64(tcg_op1);
+    tcg_temp_free_i64(tcg_op2);
+    tcg_temp_free_i64(tcg_res[0]);
+    tcg_temp_free_i64(tcg_res[1]);
 }
 
 /* Pairwise op subgroup of C3.6.16. */
-- 
1.8.5