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From: matthieu castet <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: gcc-4.0: mmx, sse asm need -mmmx, -msse
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Package: gcc-4.0
Version: 4.0.1-3
Severity: normal
Hi,
gcc-4.0 need -mmmx, -msee, ... flags in order to compil optimized
assembler. But this break runtime decision of the optimisation according
to the cpu capcibility : you can't mix in the same file generic code, and
runtime selected code.
Attached an example where -mmmx is needed.
Matthieu
-- System Information:
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Versions of packages gcc-4.0 depends on:
ii binutils 2.16.1-2 The GNU assembler, linker and bina
ii cpp-4.0 4.0.1-3 The GNU C preprocessor
ii gcc-4.0-base 4.0.1-3 The GNU Compiler Collection (base
ii libc6 2.3.2.ds1-22 GNU C Library: Shared libraries an
ii libgcc1 1:4.0.1-3 GCC support library
Versions of packages gcc-4.0 recommends:
ii libc6-dev 2.3.2.ds1-22 GNU C Library: Development Librari
pn libmudflap0-dev <none> (no description available)
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extern int mmx;
int main() {
if (mmx) {
__asm__ __volatile__ (
"pxor %%mm4, %%mm4\n\t"
: : : "%mm4"
);
}
else
;/* generic code */
}
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From: Matthias Klose <[EMAIL PROTECTED]>
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Date: Thu, 18 Aug 2005 08:48:37 +0200
To: [EMAIL PROTECTED]
Subject: Re: Bug#320726: gcc-4.0: mmx, sse asm need -mmmx, -msse
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matthieu castet writes:
> Package: gcc-4.0
> Version: 4.0.1-3
> Severity: normal
>
> Hi,
>
> gcc-4.0 need -mmmx, -msee, ... flags in order to compil optimized
> assembler. But this break runtime decision of the optimisation according
> to the cpu capcibility : you can't mix in the same file generic code, and
> runtime selected code.
>
> Attached an example where -mmmx is needed.
so where is the bug? please split the code into two files, or compile
the code two times depending on a preprocessor define into two object
files/libraries.
see the libssl0.9.7 package for an example.
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