The SSHL and USHL instructions are used with a shift operand of zero to
sign and zero-extend integer vectors into wider modes.
GCC makes extensive use of them to "unpack" vectors.
AArch64 defines a shorthand alias for that case. Instead of writing:
SSHLL <Vd>.<Ta>, <Vn>.<Tb>, 0
we can write
SXTL <Vd>.<Ta>, <Vn>.<Tb>
Similar for the unsigned versions and the high-part versions (SSHL2 -> SXTL2).
This makes the assembly of vectorised functions a bit more readable.
* config/aarch64/aarch64-simd.md
(aarch64_simd_vec_unpack<su>_lo_<mode>): Use UXTL and SXTL assembler
mnemonics.
(aarch64_simd_vec_unpack<su>_hi_<mode>): Use UXTL2 and SXTL2 assembler
mnemonics.
From-SVN: r261073
