• Status New
  • Percent Complete
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  • Task Type Bug Report
  • Category Packages → Packages: Stable
  • Assigned To No-one
  • Operating System pentium4
  • Severity Low
  • Priority Medium
  • Reported Version
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
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Attached to Project: Arch Linux 32
Opened by Erich Eckner - 25.05.2021

FS#193 - pacman does not recognize sse2 on via processor

/proc/cpuinfo:
processor : 0
vendor_id : CentaurHauls
cpu family : 6
model : 15
model name : VIA Nano U3400@800MHz
stepping : 10
cpu MHz : 798.016
cache size : 2048 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush acpi mmx fxsr sse sse2 ss tm syscall nx lm constant_tsc arch_perfmon rep_good cpuid pni monitor vmx est tm2 ssse3 cx16 xtpr sse4_1 popcnt rng rng_en ace ace_en ace2 phe phe_en pmm pmm_en lahf_lm tpr_shadow vnmi vpid ida
vmx flags : vnmi tsc_offset vtpr
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit
bogomips : 1596.53
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:

Other machine, also with via processor:

/proc/cpuinfo:
processor : 0
vendor_id : CentaurHauls
cpu family : 6
model : 13
model name : VIA C7-D Processor 1800MHz
stepping : 0
cpu MHz : 1596.326
cache size : 128 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge cmov pat clflush acpi mmx fxsr sse sse2 tm nx cpuid pni est tm2 xtpr rng rng_en ace ace_en ace2 ace2_en phe phe_en pmm pmm_en
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit
bogomips : 3193.67
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 32 bits virtual
power management:

All the builtin_cpu_supports() and builtin_cpu_is() tests fail. Thus, pacman thinks, it’s not capable of sse2 and installs i686 packages instead of pentium4 ones.

Should we complain at gcc upstream? How does the kernel compile this line in /proc/cpuinfo? What checks does it perform?

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