XFEATURE_XCR0_MASK
bvs[0] = sfp->fp_xstate.xstate_bv & XFEATURE_XCR0_MASK;
(XFEATURE_XCR0_MASK | XFEATURE_COMPRESSED);
xsetbv(0, xsave_mask & XFEATURE_XCR0_MASK);
uint64_t *rdx, *rcx, val, mask = xsave_mask & XFEATURE_XCR0_MASK;
if (xcr0 != (xsave_mask & XFEATURE_XCR0_MASK)) {
xsetbv(0, xsave_mask & XFEATURE_XCR0_MASK);
eax = xsave_mask & XFEATURE_XCR0_MASK;
edx = (xsave_mask & XFEATURE_XCR0_MASK) >> 32;
((1ULL << subleaf) & xsave_mask & XFEATURE_XCR0_MASK) == 0) {