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tcg/loongarch64: Implement tcg_out_call

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Signed-off-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211221054105.178795-22-git@xen0n.name>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
WANG Xuerui 2021-12-21 13:40:55 +08:00 committed by Richard Henderson
parent 9ee775cf29
commit a26d99d72f
1 changed files with 34 additions and 0 deletions
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34
tcg/loongarch64/tcg-target.c.inc
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@ -532,6 +532,39 @@ static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1,
tcg_out32(s, encode_djsk16_insn(op, arg1, arg2, 0));
}
static void tcg_out_call_int(TCGContext *s, const tcg_insn_unit *arg, bool tail)
{
TCGReg link = tail ? TCG_REG_ZERO : TCG_REG_RA;
ptrdiff_t offset = tcg_pcrel_diff(s, arg);
tcg_debug_assert((offset & 3) == 0);
if (offset == sextreg(offset, 0, 28)) {
/* short jump: +/- 256MiB */
if (tail) {
tcg_out_opc_b(s, offset >> 2);
} else {
tcg_out_opc_bl(s, offset >> 2);
}
} else if (offset == sextreg(offset, 0, 38)) {
/* long jump: +/- 256GiB */
tcg_target_long lo = sextreg(offset, 0, 18);
tcg_target_long hi = offset - lo;
tcg_out_opc_pcaddu18i(s, TCG_REG_TMP0, hi >> 18);
tcg_out_opc_jirl(s, link, TCG_REG_TMP0, lo >> 2);
} else {
/* far jump: 64-bit */
tcg_target_long lo = sextreg((tcg_target_long)arg, 0, 18);
tcg_target_long hi = (tcg_target_long)arg - lo;
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP0, hi);
tcg_out_opc_jirl(s, link, TCG_REG_TMP0, lo >> 2);
}
}
static void tcg_out_call(TCGContext *s, const tcg_insn_unit *arg)
{
tcg_out_call_int(s, arg, false);
}
/*
* Entry-points
*/
@ -882,6 +915,7 @@ 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. */
default:
g_assert_not_reached();
}