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On Samstag, 1. September 2007, Walter Dnes wrote: |
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> On Wed, Aug 29, 2007 at 09:43:35PM -0400, Statux wrote |
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> |
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> > CFLAGS="-march=prescott -O2 -pipe" |
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> > CHOST="i686-pc-linux-gnu" |
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> > |
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> > which is what I use on my 531 Prescott (the pni cpuflag indicates |
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> > Prescott or compatible) |
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> |
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> Thanks. I don't know if I'm reading the gcc docs too literally, but |
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> the commentary on "-mfpmath=sse" indicates that mmx/sse/sse/sse3 flags |
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> must be explicitly stated for "-mfpmath=sse" to take effect on a 32-bit |
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> system (sse is the default on 64-bit systems). So I explicitly included |
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> the flags. I also included -fomit-frame-pointer, resulting in... |
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> |
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> CFLAGS="-O2 -march=prescott -mmmx -msse -msse2 -msse3 -mfpmath=sse |
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> -fomit-frame-pointer -pipe" |
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mmx, sse,sse2,sse3 is already set by prescott (if man gcc can be trusted but |
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it should not hurt to set them) but mfpmath can result in subtile breakage. |
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fomit-frame-pointer is ok, O2 too. |
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CFLAGS="-O2 -march=prescott -fomit-frame-pointer -pipe" is much safer. |
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-- |
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