On Thu, Dec 14, 2023 at 10:43 PM Clément Jean <clementjea...@gmail.com> wrote:
> Hi, > > I'm currently learning how to write Go assembly on arm64 and I made the > following functions: > > TEXT ·AddVector16(SB),NOSPLIT,$0-48 > MOVD a+0(FP), R0 > MOVD a+8(FP), R1 > MOVD a+16(FP), R2 > MOVD a+24(FP), R3 > VMOV R0, V0.D[0] > VMOV R1, V0.D[1] > VMOV R2, V1.D[0] > VMOV R3, V1.D[1] > VADD V1.B16, V0.B16, V0.B16 > VMOV V0.D[0], R0 > VMOV V0.D[1], R1 > MOVD R0, ret+32(FP) > MOVD R1, ret+40(FP) > RET > > TEXT ·AddVector32(SB),NOSPLIT,$0-96 > MOVD a+0(FP), R0 > MOVD a+8(FP), R1 > MOVD a+16(FP), R2 > MOVD a+24(FP), R3 > MOVD a+32(FP), R4 > MOVD a+40(FP), R5 > MOVD a+48(FP), R6 > MOVD a+56(FP), R7 > VMOV R0, V0.D[0] > VMOV R1, V0.D[1] > VMOV R2, V1.D[0] > VMOV R3, V1.D[1] > VMOV R4, V2.D[0] > VMOV R5, V2.D[1] > VMOV R6, V3.D[0] > VMOV R7, V3.D[1] > VADD V2.B16, V0.B16, V0.B16 > VADD V3.B16, V1.B16, V1.B16 > VMOV V0.D[0], R0 > VMOV V0.D[1], R1 > VMOV V1.D[0], R2 > VMOV V1.D[1], R3 > MOVD R0, ret+64(FP) > MOVD R1, ret+72(FP) > MOVD R2, ret+80(FP) > MOVD R3, ret+88(FP) > RET > While these work, I'm forced to add the 16 and 32 suffixes. Is there any > way to have only one function name and link the assembly to something like: > type Uint8x16 [16]uint8 > type Uint8x32 [32]uint8 > > //go:noescape > func AddVector[T Uint8x16 | Uint8x32](a, b T) T > If there is let me know, otherwise is there some other alternatives? > > Unfortunately, I think a suffix is the best you can do without jumping through some serious (and ugly) hoops. The generics implementation opted for a "stenciling" approach, (and doesn't support specializations) so although the symbols do encode the GC shape a bit. Here's the design doc for GC Shape Stenciling https://go.googlesource.com/proposal/+/refs/heads/master/design/generics-implementation-gcshape.md > Btw any feedback on the assembly is welcome, I'm new to it. > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/3224bd47-2747-4e1d-bbc5-4a5c4a300f85n%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/3224bd47-2747-4e1d-bbc5-4a5c4a300f85n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CANrC0Bh8ZB2R87pEJJ8eKA%3DZiSRjGpa%2BawjX8vdc0dfCMExuBQ%40mail.gmail.com.
