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* 2.6.13/14 x86 Makefile - Pentiums penalized ?
@ 2005-09-13  6:04 Margit Schubert-While
  2005-09-14  5:14 ` Chris White
  0 siblings, 1 reply; 9+ messages in thread
From: Margit Schubert-While @ 2005-09-13  6:04 UTC (permalink / raw)
  To: linux-kernel

In arch/i386/makefile we have :
cflags-$(CONFIG_MPENTIUMII)     += -march=i686 $(call 
cc-option,-mtune=pentium2)
cflags-$(CONFIG_MPENTIUMIII)    += -march=i686 $(call 
cc-option,-mtune=pentium3)
cflags-$(CONFIG_MPENTIUMM)      += -march=i686 $(call 
cc-option,-mtune=pentium3)
cflags-$(CONFIG_MPENTIUM4)      += -march=i686 $(call 
cc-option,-mtune=pentium4)

According to the gcc 3.x doc, the -mtune is not avaliable for i686
and, indeed, with 3.3.5 no -mtune is generated/used (make V=1).

This, of course, heavily penalizes P4's (the notorious inc/dec).

Margit



^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2005-09-14  7:54 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-09-13  6:04 2.6.13/14 x86 Makefile - Pentiums penalized ? Margit Schubert-While
2005-09-14  5:14 ` Chris White
2005-09-14  6:48   ` Zwane Mwaikambo
2005-09-14  6:59     ` Denis Vlasenko
2005-09-14  7:21       ` Zwane Mwaikambo
2005-09-14  7:51         ` Denis Vlasenko
2005-09-14  7:48       ` Margit Schubert-While
2005-09-14  7:54         ` Denis Vlasenko
2005-09-14  7:02   ` Margit Schubert-While

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