1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
/* { dg-do compile } */
/* { dg-skip-if "" { powerpc*-*-darwin* } } */
/* { dg-options "-O3 -mdejagnu-cpu=power7" } */
/* { dg-require-effective-target lp64 } */
/* { dg-require-effective-target powerpc_vsx_ok } */
#define NO_WARN_X86_INTRINSICS 1
#include <x86intrin.h>
unsigned long long
test__pexp_cmask_u64 (unsigned long long a[4])
{
/* The _pext implmentation is nominally a popcount of the mask,
followed by a loop using count leading zeros to find the
next bit to process.
If the mask is a const, the popcount should be folded and
the constant propagation should eliminate the mask
generation loop and produce a single constant bpermd permute
control word.
This test verifies that the compiler is replacing the mask
popcount and loop with a const bperm control and generating
the bpermd for this case. */
const unsigned long mask = 0x00000000100000a4UL;
unsigned long res;
res = _pext_u64 (a[0], mask);
res = (res << 8) | _pext_u64 (a[1], mask);
res = (res << 8) | _pext_u64 (a[2], mask);
res = (res << 8) | _pext_u64 (a[3], mask);
return (res);
}
/* the resulting assembler should have 4 X bpermd and no popcntd or
cntlzd instructions. */
/* { dg-final { scan-assembler-times "bpermd" 4 } } */
/* { dg-final { scan-assembler-not "popcntd" } } */
/* { dg-final { scan-assembler-not "cntlzd" } } */
|
