> This sounds good, and we are suggesting using EXTRACT_SUBREG and friends, so
> we are on the same page, right?
I'm not suggesting creating the EXTRACT_SUBREGs as a special-case in
AArch64 code, but leaving it to generic handling of shuffles. The less
special-cases we have to deal with, the better.
> I don't understand about this. Can you explicitly point out what intrinsics
> names are really unnecessary?
These two are distinct intrinsics:
{ <16 x i8>, <16 x i8> } @llvm.arm.neon.vld2lane.v16i8(i8*, <16 x i8>,
<16 x i8>, i32, i32)
{ <8 x i8>, <8 x i8> } @llvm.arm.neon.vld2lane.v8i8(i8*, <8 x i8>, <8
x i8>, i32, i32)
The first maps directly to the AArch64 instruction, the second needs
backend hacks to put it into a form suitable for precisely the same
instruction as the first.
Cheers.
Tim.
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