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This is a bug fix for aarch64. At present, we have branches using the 32-bit (translate.c) versions of cpu_[NZCV]F, but we set the flags using the 64-bit (translate-a64.c) versions of cpu_[NZCV]F. From the view of the TCG code generator, these are unrelated variables. The bug is hard to see because we currently only read these variables from branches, and upon reaching a branch TCG will first spill live variables and then reload the arguments of the branch. Since the 32-bit versions were never live until reaching the branch, we'd re-read the data that had just been spilled from the 64-bit versions. There is currently no such problem with the cpu_exclusive_* variables, but there's no point in tempting fate. Cc: qemu-stable@nongnu.org Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net> Message-id: 1441909103-24666-2-git-send-email-rth@twiddle.net Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team