new file mode 100644
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define i386 target-specific operand constraints.
+ * Copyright (c) 2021 Linaro
+ *
+ */
+
+/*
+ * Define constraint letters for register sets:
+ * REGS(letter, register_mask)
+ */
+REGS('a', 1u << TCG_REG_EAX)
+REGS('b', 1u << TCG_REG_EBX)
+REGS('c', 1u << TCG_REG_ECX)
+REGS('d', 1u << TCG_REG_EDX)
+REGS('S', 1u << TCG_REG_ESI)
+REGS('D', 1u << TCG_REG_EDI)
+
+REGS('r', ALL_GENERAL_REGS)
+REGS('x', ALL_VECTOR_REGS)
+REGS('q', ALL_BYTEL_REGS) /* regs that can be used as a byte operand */
+REGS('Q', ALL_BYTEH_REGS) /* regs with a second byte (e.g. %ah) */
+REGS('L', ALL_GENERAL_REGS & ~SOFTMMU_RESERVE_REGS) /* qemu_ld/st */
+REGS('s', ALL_BYTEL_REGS & ~SOFTMMU_RESERVE_REGS) /* qemu_st8_i32 data */
+
+/*
+ * Define constraint letters for constants:
+ * CONST(letter, TCG_CT_CONST_* bit set)
+ */
+CONST('e', TCG_CT_CONST_S32)
+CONST('I', TCG_CT_CONST_I32)
+CONST('W', TCG_CT_CONST_WSZ)
+CONST('Z', TCG_CT_CONST_U32)
@@ -235,5 +235,6 @@ static inline void tb_target_set_jmp_target(uintptr_t tc_ptr, uintptr_t jmp_rx,
#define TCG_TARGET_NEED_LDST_LABELS
#endif
#define TCG_TARGET_NEED_POOL_LABELS
+#define TCG_TARGET_CON_STR_H
#endif
@@ -103,8 +103,10 @@ static void tcg_register_jit_int(const void *buf, size_t size,
__attribute__((unused));
/* Forward declarations for functions declared and used in tcg-target.c.inc. */
+#ifndef TCG_TARGET_CON_STR_H
static const char *target_parse_constraint(TCGArgConstraint *ct,
const char *ct_str, TCGType type);
+#endif
static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg1,
intptr_t arg2);
static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg);
@@ -2409,7 +2411,6 @@ static void process_op_defs(TCGContext *s)
for (op = 0; op < NB_OPS; op++) {
TCGOpDef *def = &tcg_op_defs[op];
const TCGTargetOpDef *tdefs;
- TCGType type;
int i, nb_args;
if (def->flags & TCG_OPF_NOT_PRESENT) {
@@ -2425,7 +2426,6 @@ static void process_op_defs(TCGContext *s)
/* Missing TCGTargetOpDef entry. */
tcg_debug_assert(tdefs != NULL);
- type = (def->flags & TCG_OPF_64BIT ? TCG_TYPE_I64 : TCG_TYPE_I32);
for (i = 0; i < nb_args; i++) {
const char *ct_str = tdefs->args_ct_str[i];
/* Incomplete TCGTargetOpDef entry. */
@@ -2457,11 +2457,34 @@ static void process_op_defs(TCGContext *s)
def->args_ct[i].ct |= TCG_CT_CONST;
ct_str++;
break;
+
+#ifdef TCG_TARGET_CON_STR_H
+ /* Include all of the target-specific constraints. */
+
+#undef CONST
+#define CONST(CASE, MASK) \
+ case CASE: def->args_ct[i].ct |= MASK; ct_str++; break;
+#define REGS(CASE, MASK) \
+ case CASE: def->args_ct[i].regs |= MASK; ct_str++; break;
+
+#include "tcg-target-con-str.h"
+
+#undef REGS
+#undef CONST
default:
- ct_str = target_parse_constraint(&def->args_ct[i],
- ct_str, type);
/* Typo in TCGTargetOpDef constraint. */
- tcg_debug_assert(ct_str != NULL);
+ g_assert_not_reached();
+#else
+ default:
+ {
+ TCGType type = (def->flags & TCG_OPF_64BIT
+ ? TCG_TYPE_I64 : TCG_TYPE_I32);
+ ct_str = target_parse_constraint(&def->args_ct[i],
+ ct_str, type);
+ /* Typo in TCGTargetOpDef constraint. */
+ tcg_debug_assert(ct_str != NULL);
+ }
+#endif
}
}
}
@@ -132,6 +132,22 @@ static const int tcg_target_call_oarg_regs[] = {
# define TCG_REG_L1 TCG_REG_EDX
#endif
+#define ALL_BYTEH_REGS 0x0000000fu
+#if TCG_TARGET_REG_BITS == 64
+# define ALL_GENERAL_REGS 0x0000ffffu
+# define ALL_VECTOR_REGS 0xffff0000u
+# define ALL_BYTEL_REGS ALL_GENERAL_REGS
+#else
+# define ALL_GENERAL_REGS 0x000000ffu
+# define ALL_VECTOR_REGS 0x00ff0000u
+# define ALL_BYTEL_REGS ALL_BYTEH_REGS
+#endif
+#ifdef CONFIG_SOFTMMU
+# define SOFTMMU_RESERVE_REGS ((1 << TCG_REG_L0) | (1 << TCG_REG_L1))
+#else
+# define SOFTMMU_RESERVE_REGS 0
+#endif
+
/* The host compiler should supply <cpuid.h> to enable runtime features
detection, as we're not going to go so far as our own inline assembly.
If not available, default values will be assumed. */
@@ -193,91 +209,6 @@ static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
return true;
}
-#if TCG_TARGET_REG_BITS == 64
-#define ALL_GENERAL_REGS 0x0000ffffu
-#define ALL_VECTOR_REGS 0xffff0000u
-#else
-#define ALL_GENERAL_REGS 0x000000ffu
-#define ALL_VECTOR_REGS 0x00ff0000u
-#endif
-
-/* parse target specific constraints */
-static const char *target_parse_constraint(TCGArgConstraint *ct,
- const char *ct_str, TCGType type)
-{
- switch(*ct_str++) {
- case 'a':
- tcg_regset_set_reg(ct->regs, TCG_REG_EAX);
- break;
- case 'b':
- tcg_regset_set_reg(ct->regs, TCG_REG_EBX);
- break;
- case 'c':
- tcg_regset_set_reg(ct->regs, TCG_REG_ECX);
- break;
- case 'd':
- tcg_regset_set_reg(ct->regs, TCG_REG_EDX);
- break;
- case 'S':
- tcg_regset_set_reg(ct->regs, TCG_REG_ESI);
- break;
- case 'D':
- tcg_regset_set_reg(ct->regs, TCG_REG_EDI);
- break;
- case 'q':
- /* A register that can be used as a byte operand. */
- ct->regs = TCG_TARGET_REG_BITS == 64 ? 0xffff : 0xf;
- break;
- case 'Q':
- /* A register with an addressable second byte (e.g. %ah). */
- ct->regs = 0xf;
- break;
- case 'r':
- /* A general register. */
- ct->regs |= ALL_GENERAL_REGS;
- break;
- case 'W':
- /* With TZCNT/LZCNT, we can have operand-size as an input. */
- ct->ct |= TCG_CT_CONST_WSZ;
- break;
- case 'x':
- /* A vector register. */
- ct->regs |= ALL_VECTOR_REGS;
- break;
-
- case 'L':
- /* qemu_ld/st data+address constraint */
- ct->regs = TCG_TARGET_REG_BITS == 64 ? 0xffff : 0xff;
-#ifdef CONFIG_SOFTMMU
- tcg_regset_reset_reg(ct->regs, TCG_REG_L0);
- tcg_regset_reset_reg(ct->regs, TCG_REG_L1);
-#endif
- break;
- case 's':
- /* qemu_st8_i32 data constraint */
- ct->regs = 0xf;
-#ifdef CONFIG_SOFTMMU
- tcg_regset_reset_reg(ct->regs, TCG_REG_L0);
- tcg_regset_reset_reg(ct->regs, TCG_REG_L1);
-#endif
- break;
-
- case 'e':
- ct->ct |= TCG_CT_CONST_S32;
- break;
- case 'Z':
- ct->ct |= TCG_CT_CONST_U32;
- break;
- case 'I':
- ct->ct |= TCG_CT_CONST_I32;
- break;
-
- default:
- return NULL;
- }
- return ct_str;
-}
-
/* test if a constant matches the constraint */
static inline int tcg_target_const_match(tcg_target_long val, TCGType type,
const TCGArgConstraint *arg_ct)
This eliminates the target-specific function target_parse_constraint and folds it into the single caller, process_op_defs. Since this is done directly into the switch statement, duplicates are compilation errors rather than silently ignored at runtime. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- tcg/i386/tcg-target-con-str.h | 33 +++++++++++ tcg/i386/tcg-target.h | 1 + tcg/tcg.c | 33 +++++++++-- tcg/i386/tcg-target.c.inc | 101 ++++++---------------------------- 4 files changed, 78 insertions(+), 90 deletions(-) create mode 100644 tcg/i386/tcg-target-con-str.h