On 7/22/20 2:15 AM, firstname.lastname@example.org wrote:
> From: Frank Chang <email@example.com>
> For floating-point operations, the scalar can be taken from a scalar
> f register. If FLEN > SEW, the value in the f registers is checked for
> a valid NaN-boxed value, in which case the least-significant SEW bits
> of the f register are used, else the canonical NaN value is used.
> Add helper to generate the correspond NaN-boxed value or the SEW-bit
> canonical NaN for floating-point operations.
> Signed-off-by: Frank Chang <firstname.lastname@example.org>
> target/riscv/helper.h | 2 ++
> target/riscv/vector_helper.c | 32 ++++++++++++++++++++++++++++++++
> 2 files changed, 34 insertions(+)
The helper can be done inline in two tcg ops.
Though, really, we need to coordinate with Liu Zhiwei's other patch set that
also deals with nan-boxing.
but has to extend for the case of SEW=16?