From: Steve Munroe <sjmunroe@us.ibm.com>
To: libc-hacker@sources.redhat.com
Cc: Mark Brown <bmark@us.ibm.com>
Subject: Accessing dl_hwcap from libm
Date: Wed, 12 May 2004 02:23:00 -0000 [thread overview]
Message-ID: <OF25177B54.E1844D9E-ON86256E92.000C28D4-86256E92.000CDE63@us.ibm.com> (raw)
For powerpc32 I can't assume that the fsqrt instruction is implemented.
Currently it is implemented on ALL PPC64 hardware. So I would
like to use the AT_HWCAP to detect this and conditionally use fsqrt.
Looking at i386/fpu/fesetround I see that dl_hwcap is used to check for
SSE.
if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
But when I try something similar on powerpc w_sqrt I get:
../sysdeps/powerpc/fpu/w_sqrtf.c:37: undefined reference to
`_rtld_global_ro'
It seems that fesetround (and similar functions) are included in libc,
not libm. So is it fundamental that access to dl_dwcap (_rtld_global_ro)
is restricted to libc, or can access be extended to libm?
Steven J. Munroe
Linux on Power Toolchain Architect
IBM Corporation, Linux Technology Center
next reply other threads:[~2004-05-12 2:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-12 2:23 Steve Munroe [this message]
2004-05-12 3:12 ` Ulrich Drepper
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