target-i386: Implement PDEP, PEXT

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-01-23 18:09:43 -08:00
parent 5f1f4b1771
commit 0592f74a75
3 changed files with 71 additions and 0 deletions

View file

@ -488,6 +488,38 @@ target_ulong helper_bsr(target_ulong t0)
return helper_lzcnt(t0, 0);
}
#if TARGET_LONG_BITS == 32
# define ctztl ctz32
#else
# define ctztl ctz64
#endif
target_ulong helper_pdep(target_ulong src, target_ulong mask)
{
target_ulong dest = 0;
int i, o;
for (i = 0; mask != 0; i++) {
o = ctztl(mask);
mask &= mask - 1;
dest |= ((src >> i) & 1) << o;
}
return dest;
}
target_ulong helper_pext(target_ulong src, target_ulong mask)
{
target_ulong dest = 0;
int i, o;
for (o = 0; mask != 0; o++) {
i = ctztl(mask);
mask &= mask - 1;
dest |= ((src >> i) & 1) << o;
}
return dest;
}
#define SHIFT 0
#include "shift_helper_template.h"
#undef SHIFT