mirror of https://gitee.com/openkylin/qemu.git
a2db06da7d
The resulting cc is only dependent on the result and the carry-out. Carry-out and borrow-out are inverses, so are trivially converted. With tcg ops, it is easier to compute borrow-out than carry-out, so save result and borrow-out rather than the inputs. Borrow-out for 64-bit inputs is had via tcg_gen_sub2_i64 directly into cc_src. Borrow-out for 32-bit inputs is had via extraction from a normal 64-bit sub (with zero-extended inputs). Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20201214221356.68039-4-richard.henderson@linaro.org> Signed-off-by: Cornelia Huck <cohuck@redhat.com> |
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