[PATCH v2 38/81] tcg/loongarch64: Fold the ext{8, 16, 32}[us] cases into {s}extract

[Richard Henderson]

Accept byte and word extensions with the extract opcodes.
This is preparatory to removing the specialized extracts.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/loongarch64/tcg-target-has.h | 15 ++++++++++++--
 tcg/loongarch64/tcg-target.c.inc | 34 ++++++++++++++++++++++++++++++--
 2 files changed, 45 insertions(+), 4 deletions(-)

diff --git a/tcg/loongarch64/tcg-target-has.h b/tcg/loongarch64/tcg-target-has.h
index e4333c36c6..ac7d2fcdf9 100644
--- a/tcg/loongarch64/tcg-target-has.h
+++ b/tcg/loongarch64/tcg-target-has.h
@@ -17,7 +17,7 @@
 #define TCG_TARGET_HAS_rot_i32          1
 #define TCG_TARGET_HAS_deposit_i32      1
 #define TCG_TARGET_HAS_extract_i32      1
-#define TCG_TARGET_HAS_sextract_i32     0
+#define TCG_TARGET_HAS_sextract_i32     1
 #define TCG_TARGET_HAS_extract2_i32     0
 #define TCG_TARGET_HAS_add2_i32         0
 #define TCG_TARGET_HAS_sub2_i32         0
@@ -52,7 +52,7 @@
 #define TCG_TARGET_HAS_rot_i64          1
 #define TCG_TARGET_HAS_deposit_i64      1
 #define TCG_TARGET_HAS_extract_i64      1
-#define TCG_TARGET_HAS_sextract_i64     0
+#define TCG_TARGET_HAS_sextract_i64     1
 #define TCG_TARGET_HAS_extract2_i64     0
 #define TCG_TARGET_HAS_extr_i64_i32     1
 #define TCG_TARGET_HAS_ext8s_i64        1
@@ -109,5 +109,16 @@
 #define TCG_TARGET_HAS_cmpsel_vec       0
 #define TCG_TARGET_HAS_tst_vec          0
 
+#define TCG_TARGET_extract_valid(type, ofs, len)   1
+
+static inline bool
+tcg_target_sextract_valid(TCGType type, unsigned ofs, unsigned len)
+{
+    if (type == TCG_TYPE_I64 && ofs + len == 32) {
+        return true;
+    }
+    return ofs == 0 && (len == 8 || len == 16);
+}
+#define TCG_TARGET_sextract_valid  tcg_target_sextract_valid
 
 #endif
diff --git a/tcg/loongarch64/tcg-target.c.inc b/tcg/loongarch64/tcg-target.c.inc
index 3dff29facb..cebe8dd354 100644
--- a/tcg/loongarch64/tcg-target.c.inc
+++ b/tcg/loongarch64/tcg-target.c.inc
@@ -1375,10 +1375,38 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, 
TCGType type,
         break;
 
     case INDEX_op_extract_i32:
-        tcg_out_opc_bstrpick_w(s, a0, a1, a2, a2 + args[3] - 1);
+        if (a2 == 0 && args[3] <= 12) {
+            tcg_out_opc_andi(s, a0, a1, (1 << args[3]) - 1);
+        } else {
+            tcg_out_opc_bstrpick_w(s, a0, a1, a2, a2 + args[3] - 1);
+        }
         break;
     case INDEX_op_extract_i64:
-        tcg_out_opc_bstrpick_d(s, a0, a1, a2, a2 + args[3] - 1);
+        if (a2 == 0 && args[3] <= 12) {
+            tcg_out_opc_andi(s, a0, a1, (1 << args[3]) - 1);
+        } else {
+            tcg_out_opc_bstrpick_d(s, a0, a1, a2, a2 + args[3] - 1);
+        }
+        break;
+
+    case INDEX_op_sextract_i64:
+        if (a2 + args[3] == 32) {
+            if (a2 == 0) {
+                tcg_out_ext32s(s, a0, a1);
+            } else {
+                tcg_out_opc_srai_w(s, a0, a1, a2);
+            }
+            break;
+        }
+        /* FALLTHRU */
+    case INDEX_op_sextract_i32:
+        if (a2 == 0 && args[3] == 8) {
+            tcg_out_ext8s(s, TCG_TYPE_REG, a0, a1);
+        } else if (a2 == 0 && args[3] == 16) {
+            tcg_out_ext16s(s, TCG_TYPE_REG, a0, a1);
+        } else {
+            g_assert_not_reached();
+        }
         break;
 
     case INDEX_op_deposit_i32:
@@ -2243,6 +2271,8 @@ tcg_target_op_def(TCGOpcode op, TCGType type, unsigned 
flags)
     case INDEX_op_not_i64:
     case INDEX_op_extract_i32:
     case INDEX_op_extract_i64:
+    case INDEX_op_sextract_i32:
+    case INDEX_op_sextract_i64:
     case INDEX_op_bswap16_i32:
     case INDEX_op_bswap16_i64:
     case INDEX_op_bswap32_i32:
-- 
2.43.0