From 23b7aa1d2af04ba57cc94f74d9f0ab25dce72fa0 Mon Sep 17 00:00:00 2001 From: Pranith Kumar Date: Fri, 30 Jun 2017 10:36:12 -0400 Subject: tcg/aarch64: Introduce and use long branch to register MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit We can use a branch to register instruction for exit_tb for offsets greater than 128MB. CC: Alex Bennée Reviewed-by: Richard Henderson Signed-off-by: Pranith Kumar Message-Id: <20170630143614.31059-1-bobby.prani@gmail.com> Signed-off-by: Richard Henderson --- tcg/aarch64/tcg-target.inc.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) (limited to 'tcg/aarch64') diff --git a/tcg/aarch64/tcg-target.inc.c b/tcg/aarch64/tcg-target.inc.c index 1fa3bccc89..8fce11ace7 100644 --- a/tcg/aarch64/tcg-target.inc.c +++ b/tcg/aarch64/tcg-target.inc.c @@ -819,6 +819,17 @@ static inline void tcg_out_goto(TCGContext *s, tcg_insn_unit *target) tcg_out_insn(s, 3206, B, offset); } +static inline void tcg_out_goto_long(TCGContext *s, tcg_insn_unit *target) +{ + ptrdiff_t offset = target - s->code_ptr; + if (offset == sextract64(offset, 0, 26)) { + tcg_out_insn(s, 3206, BL, offset); + } else { + tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_TMP, (intptr_t)target); + tcg_out_insn(s, 3207, BR, TCG_REG_TMP); + } +} + static inline void tcg_out_goto_noaddr(TCGContext *s) { /* We pay attention here to not modify the branch target by reading from @@ -1364,10 +1375,10 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, case INDEX_op_exit_tb: /* Reuse the zeroing that exists for goto_ptr. */ if (a0 == 0) { - tcg_out_goto(s, s->code_gen_epilogue); + tcg_out_goto_long(s, s->code_gen_epilogue); } else { tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_X0, a0); - tcg_out_goto(s, tb_ret_addr); + tcg_out_goto_long(s, tb_ret_addr); } break; -- cgit v1.2.1