Simd instructions

bearophile bearophileHUGS at
Thu Jul 18 08:16:20 PDT 2013

As a final step to compute the product of two complex numbers I 
perform a simd operation on double2:

x3 = [x3.array[1] - x2.array[1], x3.array[0] + x2.array[0]];

But ldc2 compiles that quite badly (I don't know who's to blame, 
if necessary I will open a LLVM bug report), so I have tried to 
use an instruction addsubpd.

To do it I have imported ldc.gccbuiltins_x86 and then I use:

x3 = __builtin_ia32_addsubpd(x3, x2);

but ldc2 gives me:

LLVM ERROR: Cannot select: intrinsic %llvm.x86.sse3.addsub.pd
Stack dump:
0.      Running pass 'X86 DAG->DAG Instruction Selection' on 

Can you help me?


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