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target-arm: A64: Fix bug in add_sub_ext handling of rn

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rn == 31 always means SP (not XZR) whether an add_sub_ext
instruction is setting the flags or not; only rd has behaviour
dependent on whether we are setting flags.

Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-id: 1394822294-14837-3-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Alex Bennée 2014-03-17 16:31:47 +00:00 committed by Peter Maydell
parent a984e42c91
commit cf4ab1af29
1 changed files with 1 additions and 2 deletions
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target-arm/translate-a64.c
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@ -3096,12 +3096,11 @@ static void disas_add_sub_ext_reg(DisasContext *s, uint32_t insn)
/* non-flag setting ops may use SP */
if (!setflags) {
tcg_rn = read_cpu_reg_sp(s, rn, sf);
tcg_rd = cpu_reg_sp(s, rd);
} else {
tcg_rn = read_cpu_reg(s, rn, sf);
tcg_rd = cpu_reg(s, rd);
}
tcg_rn = read_cpu_reg_sp(s, rn, sf);
tcg_rm = read_cpu_reg(s, rm, sf);
ext_and_shift_reg(tcg_rm, tcg_rm, option, imm3);