From: Alex Bennée <alex.bennee@xxxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Alex Bennée <alex.bennee@xxxxxxxxxx>
Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>
---
target-arm/translate-a64.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 37252b7..444dd85 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -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);
--
1.9.0
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