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List:       gcc-bugs
Subject:    [Bug c/87171] New: -march=native doesn't detect flags correctly on G4560
From:       "luz at mujerlibre dot net" <gcc-bugzilla () gcc ! gnu ! org>
Date:       2018-08-31 15:26:54
Message-ID: bug-87171-4 () http ! gcc ! gnu ! org/bugzilla/
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87171

            Bug ID: 87171
           Summary: -march=native doesn't detect flags correctly on G4560
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: luz at mujerlibre dot net
  Target Milestone: ---

-march=native on G4560 disables certain flags that appear in /proc/cpuinfo and
are enabled with -march=goldmont. The goldmont builds run fine so it appears
that those flags should be enabled with -march=native.

-march=native:
  -mxsave                               [disabled]
  -mxsavec                              [disabled]
  -mxsaveopt                            [disabled]
  -mxsaves                              [disabled]

-march=goldmont:
  -mxsave                               [enabled]
  -mxsavec                              [enabled]
  -mxsaveopt                            [enabled]
  -mxsaves                              [enabled]

/proc/cpuinfo:
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 art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc
cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2
ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt
tsc_deadline_timer aes xsave rdrand lahf_lm abm 3dnowprefetch cpuid_fault
invpcid_single pti tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust
smep erms invpcid mpx rdseed smap clflushopt intel_pt xsaveopt xsavec xgetbv1
xsaves dtherm arat pln pts hwp hwp_notify hwp_act_window hwp_epp=
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