[MacPorts] #67018: atlas uses cpu optimizing flags based on arch: ppc = G4, ppc64 = G5; the former needs not be correct
MacPorts
noreply at macports.org
Tue Feb 28 19:29:00 UTC 2023
#67018: atlas uses cpu optimizing flags based on arch: ppc = G4, ppc64 = G5; the
former needs not be correct
--------------------------+----------------------
Reporter: barracuda156 | Owner: Veence
Type: defect | Status: assigned
Priority: Normal | Milestone:
Component: ports | Version: 2.8.1
Keywords: | Port: atlas
--------------------------+----------------------
{{{
} elseif {${build_arch} eq "ppc"} {
# PPC
set gcc_flags "-O3 -mcpu=7400 -mtune=7400\
-fno-schedule-insns -fschedule-insns2 -fPIC \
-force_cpusubtype_ALL"
set clang_flags "-O3 -arch ppc -fPIC"
set gvct_flag "-maltivec -mabi=altivec"
set cvct_flag "-maltivec"
configure.args-append -A 4
# On Leopard, we may warn the user that ppc
# is not as efficient as ppc64
pre-fetch {
if {${native_arch} eq "ppc64"} {
ui_msg "Compiling for ppc on a G5 machine.\
This could lead to reduced performance."
}
}
} else {
# PPC64
set gcc_flags "-mcpu=970 -mtune=970 -mvrsave -mpowerpc64\
-fno-schedule-insns -fschedule-insns2 -fPIC \
-force_cpusubtype_ALL"
# Clang has no PPC64 target so compile for PPC
set clang_flags "-O3 -arch ppc -fPIC"
set gvct_flag "-maltivec -mabi=altivec"
set cvct_flag "-maltivec"
}
}}}
While ppc64 requires G5, ppc can be either. It is desirable to have
variants for both, so that the user can choose, or use -mtune=native (if
old GCC supports that).
What we have now gonna make suboptimal optimization on G5 when build is
for ppc32 (which is most cases, as long as Macports goes).
--
Ticket URL: <https://trac.macports.org/ticket/67018>
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