tcg/aarch64: Introduce and use long branch to register
We can use a branch to register instruction for exit_tb for offsets greater than 128MB. CC: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> Message-Id: <20170630143614.31059-1-bobby.prani@gmail.com> Signed-off-by: Richard Henderson <rth@twiddle.net>
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@ -819,6 +819,17 @@ static inline void tcg_out_goto(TCGContext *s, tcg_insn_unit *target)
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tcg_out_insn(s, 3206, B, offset);
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tcg_out_insn(s, 3206, B, offset);
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}
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}
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static inline void tcg_out_goto_long(TCGContext *s, tcg_insn_unit *target)
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{
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ptrdiff_t offset = target - s->code_ptr;
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if (offset == sextract64(offset, 0, 26)) {
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tcg_out_insn(s, 3206, BL, offset);
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} else {
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tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_TMP, (intptr_t)target);
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tcg_out_insn(s, 3207, BR, TCG_REG_TMP);
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}
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}
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static inline void tcg_out_goto_noaddr(TCGContext *s)
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static inline void tcg_out_goto_noaddr(TCGContext *s)
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{
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{
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/* We pay attention here to not modify the branch target by reading from
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/* We pay attention here to not modify the branch target by reading from
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@ -1364,10 +1375,10 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
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case INDEX_op_exit_tb:
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case INDEX_op_exit_tb:
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/* Reuse the zeroing that exists for goto_ptr. */
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/* Reuse the zeroing that exists for goto_ptr. */
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if (a0 == 0) {
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if (a0 == 0) {
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tcg_out_goto(s, s->code_gen_epilogue);
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tcg_out_goto_long(s, s->code_gen_epilogue);
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} else {
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} else {
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tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_X0, a0);
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tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_X0, a0);
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tcg_out_goto(s, tb_ret_addr);
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tcg_out_goto_long(s, tb_ret_addr);
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}
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}
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break;
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break;
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