On 8/1/07, Diego Novillo <dnovillo@xxxxxxxxxx> wrote:
> On 8/1/07 1:49 PM, Mike Lewis wrote:
>
> > I'm having an issue getting my software to compile with GCC 4.2. I
> > use x86 intrinsics such as _mm_slli_epi32 and I pass the second
> > parameter as a variable. This works fine with GCC 4.1, and ICC 9.1.
> > Now, with GCC 4.2 I get "error: shift must be an immediate" for the
> > lines.
>
> Could you post the test case? If GCC is not propagating an immediate
> constant into the intrinsic call, you will get this message.
>
Here's a simple one:
#include <xmmintrin.h>
void a( int n ) {
__m128i a;
a = _mm_slli_epi32( a, n );
}
Generates valid code with ICC and GCC 4.1 and errors 4.2.
Now, the IA-32 Software Developer's Manual defines the second argument
of _mm_slli_epi32 as "int count." So it should allow a variable (in
others such as _mm_slli_epi128 it specifies it as "int imm," but the
mnemonic for that one requires an immediate).
Thanks again,
Mike
