I have an "AMD Athlon(tm) 64 X2 Dual Core Processor 4800+", which supports "pni" alias SSE3. If I run gfortran -v -O3 -march=native, then -march=k8 and not -march=k8-sse3 is used.
-- Summary: -march=native detects k8 and not k8-sse3 Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: enhancement Priority: P3 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: burnus at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33312