Contrary to
https://groups.google.com/forum/#!msg/julia-users/B_5SYRaY9YI/0Auz3c_IWr8J
I'm not seeing popcnt emitted on my machine. Is there something additional
I need to do? Is there a way to see what cpu-target julia is setting?
cat /proc/cpuinfo | grep popcnt
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor
ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln
pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1
avx2 smep bmi2 erms invpcid xsaveopt
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor
ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln
pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1
avx2 smep bmi2 erms invpcid xsaveopt
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor
ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln
pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1
avx2 smep bmi2 erms invpcid xsaveopt
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor
ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln
pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1
avx2 smep bmi2 erms invpcid xsaveopt
...
julia> @code_native count_ones(0)
.text
Filename: int.jl
Source line: 133
pushq %rbp
movq %rsp, %rbp
Source line: 133
movq %rdi, %rax
shrq %rax
movabsq $6148914691236517205, %rcx # imm = 0x5555555555555555
andq %rax, %rcx
subq %rcx, %rdi
movabsq $3689348814741910323, %rcx # imm = 0x3333333333333333
movq %rdi, %rax
andq %rcx, %rax
shrq $2, %rdi
andq %rcx, %rdi
addq %rax, %rdi
movabsq $72340172838076673, %rcx # imm = 0x101010101010101
movabsq $1085102592571150095, %rax # imm = 0xF0F0F0F0F0F0F0F
movq %rdi, %rdx
shrq $4, %rdx
addq %rdi, %rdx
andq %rdx, %rax
imulq %rcx, %rax
shrq $56, %rax
popq %rbp
ret
jamie@wanderer:~$ julia --version
julia version 0.4.2
