[PATCH 06/30] tcg/loongarch: Define the operand constraints

[WANG Xuerui <git@xen0n.name>]

Signed-off-by: WANG Xuerui <git@xen0n.name>
---
 tcg/loongarch/tcg-target-con-str.h | 26 ++++++++++++++++
 tcg/loongarch/tcg-target.c.inc     | 48 ++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 tcg/loongarch/tcg-target-con-str.h

diff --git a/tcg/loongarch/tcg-target-con-str.h b/tcg/loongarch/tcg-target-con-str.h
new file mode 100644
index 0000000000..30b42d83a4
--- /dev/null
+++ b/tcg/loongarch/tcg-target-con-str.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define LoongArch target-specific operand constraints.
+ *
+ * Copyright (c) 2021 WANG Xuerui <git@xen0n.name>
+ *
+ * Based on tcg/riscv/tcg-target-con-str.h
+ *
+ * Copyright (c) 2021 Linaro
+ */
+
+/*
+ * Define constraint letters for register sets:
+ * REGS(letter, register_mask)
+ */
+REGS('r', ALL_GENERAL_REGS)
+REGS('L', ALL_GENERAL_REGS & ~SOFTMMU_RESERVE_REGS)
+
+/*
+ * Define constraint letters for constants:
+ * CONST(letter, TCG_CT_CONST_* bit set)
+ */
+CONST('I', TCG_CT_CONST_S12)
+CONST('N', TCG_CT_CONST_N12)
+CONST('U', TCG_CT_CONST_U12)
+CONST('Z', TCG_CT_CONST_ZERO)
diff --git a/tcg/loongarch/tcg-target.c.inc b/tcg/loongarch/tcg-target.c.inc
index f8c71bbaf4..594b434b47 100644
--- a/tcg/loongarch/tcg-target.c.inc
+++ b/tcg/loongarch/tcg-target.c.inc
@@ -116,3 +116,51 @@ static const int tcg_target_call_oarg_regs[] = {
     TCG_REG_A0,
     TCG_REG_A1,
 };
+
+#define TCG_CT_CONST_ZERO  0x100
+#define TCG_CT_CONST_S12   0x200
+#define TCG_CT_CONST_N12   0x400
+#define TCG_CT_CONST_U12   0x800
+
+#define ALL_GENERAL_REGS      MAKE_64BIT_MASK(0, 32)
+/*
+ * For softmmu, we need to avoid conflicts with the first 5
+ * argument registers to call the helper.  Some of these are
+ * also used for the tlb lookup.
+ */
+#ifdef CONFIG_SOFTMMU
+#define SOFTMMU_RESERVE_REGS  MAKE_64BIT_MASK(TCG_REG_A0, 5)
+#else
+#define SOFTMMU_RESERVE_REGS  0
+#endif
+
+
+static inline tcg_target_long sextreg(tcg_target_long val, int pos, int len)
+{
+    if (TCG_TARGET_REG_BITS == 32) {
+        return sextract32(val, pos, len);
+    } else {
+        return sextract64(val, pos, len);
+    }
+}
+
+/* test if a constant matches the constraint */
+static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
+{
+    if (ct & TCG_CT_CONST) {
+        return 1;
+    }
+    if ((ct & TCG_CT_CONST_ZERO) && val == 0) {
+        return 1;
+    }
+    if ((ct & TCG_CT_CONST_S12) && val == sextreg(val, 0, 12)) {
+        return 1;
+    }
+    if ((ct & TCG_CT_CONST_N12) && -val == sextreg(-val, 0, 12)) {
+        return 1;
+    }
+    if ((ct & TCG_CT_CONST_U12) && val >= 0 && val <= 0xfff) {
+        return 1;
+    }
+    return 0;
+}
-- 
2.33.0