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tcg: Split out tcg_out_exit_tb

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The INDEX_op_exit_tb opcode needs no register allocation.
Split out a dedicated helper function for it.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-11-26 12:42:06 -08:00
parent 7c9236d6d6
commit b55a8d9d0b
11 changed files with 121 additions and 97 deletions
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22
tcg/aarch64/tcg-target.c.inc
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@ -1887,6 +1887,17 @@ static void tcg_out_qemu_st(TCGContext *s, TCGReg data_reg, TCGReg addr_reg,
static const tcg_insn_unit *tb_ret_addr;
static void tcg_out_exit_tb(TCGContext *s, uintptr_t a0)
{
/* Reuse the zeroing that exists for goto_ptr. */
if (a0 == 0) {
tcg_out_goto_long(s, tcg_code_gen_epilogue);
} else {
tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_X0, a0);
tcg_out_goto_long(s, tb_ret_addr);
}
}
static void tcg_out_op(TCGContext *s, TCGOpcode opc,
const TCGArg args[TCG_MAX_OP_ARGS],
const int const_args[TCG_MAX_OP_ARGS])
@ -1906,16 +1917,6 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
#define REG0(I) (const_args[I] ? TCG_REG_XZR : (TCGReg)args[I])
switch (opc) {
case INDEX_op_exit_tb:
/* Reuse the zeroing that exists for goto_ptr. */
if (a0 == 0) {
tcg_out_goto_long(s, tcg_code_gen_epilogue);
} else {
tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_X0, a0);
tcg_out_goto_long(s, tb_ret_addr);
}
break;
case INDEX_op_goto_tb:
tcg_debug_assert(s->tb_jmp_insn_offset != NULL);
/*
@ -2305,6 +2306,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
case INDEX_op_mov_i32: /* Always emitted via tcg_out_mov. */
case INDEX_op_mov_i64:
case INDEX_op_call: /* Always emitted via tcg_out_call. */
case INDEX_op_exit_tb: /* Always emitted via tcg_out_exit_tb. */
default:
g_assert_not_reached();
}