On Tue, May 20, 2014 at 07:18:40AM +0100, Carrot Wei wrote: > Hi Hi,
> The last operand of instruction sqdmulh can only be low fp registers, > so we should use constraint "x". But the intrinsic functions use "w". > This patch fixed the constrains in these intrinsics. This restriction is only on the _s16 variants of the intrinsics. From the ARMv8 Architecture Reference Manual: <Vm> Is the name of the second SIMD&FP source register, [...] Restricted to V0-V15 when element size <Ts> is H. The patch is correct (though I can't approve it) for vqdmulh_n_s16 and vqdmulhq_n_s16, but the two hunks for vqdmulh_n_s32 and vqdmulhq_n_s32 should be dropped as they are too restrictive. Thanks, James > 2014-05-19 Guozhi Wei <car...@google.com> > > * config/aarch64/arm_neon.h (vqdmulh_n_s16): Change > the last operand's constraint. > (vqdmulh_n_s32): Likewise. > (vqdmulhq_n_s16): Likewise. > (vqdmulhq_n_s32): Likewise.
