performance: 0.895
device: 0.870
VMM: 0.802
network: 0.765
vnc: 0.625
architecture: 0.581
arm: 0.543
kernel: 0.513
boot: 0.473
files: 0.444
PID: 0.435
ppc: 0.397
TCG: 0.388
hypervisor: 0.324
socket: 0.324
permissions: 0.311
KVM: 0.301
i386: 0.280
semantic: 0.258
graphic: 0.255
assembly: 0.247
risc-v: 0.241
virtual: 0.218
x86: 0.205
register: 0.143
mistranslation: 0.130
user-level: 0.086
peripherals: 0.068
debug: 0.063

optimize nvme_directive_receive() function