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@@ -0,0 +1,96 @@
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+--- a/libc/sysdeps/linux/i386/Makefile.arch
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++++ b/libc/sysdeps/linux/i386/Makefile.arch
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+@@ -9,6 +9,7 @@ CSRC := brk.c sigaction.c __syscall_erro
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+
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+ SSRC := \
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+ __longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S bsd-_setjmp.S \
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+- sync_file_range.S syscall.S mmap.S mmap64.S posix_fadvise64.S
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++ sync_file_range.S syscall.S mmap.S mmap64.S posix_fadvise64.S \
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++ s_copysign.S s_copysignf.S s_copysignl.S
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+
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+ include $(top_srcdir)libc/sysdeps/linux/Makefile.commonarch
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+--- /dev/null
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++++ b/libc/sysdeps/linux/i386/s_copysign.S
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+@@ -0,0 +1,25 @@
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++/*
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++ * Written by J.T. Conklin <[email protected]>.
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++ * Public domain.
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++ */
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++
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++#define _ERRNO_H 1
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++#include <features.h>
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++#include <bits/errno.h>
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++
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++.text
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++.global copysign
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++.type copysign,%function
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++copysign:
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++ movl 16(%esp),%edx
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++ movl 8(%esp),%eax
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++ andl $0x80000000,%edx
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++ andl $0x7fffffff,%eax
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++ orl %edx,%eax
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++ movl %eax,8(%esp)
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++ fldl 4(%esp)
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++ ret
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++.size copysign,.-copysign
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++
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++libc_hidden_def(copysign)
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++
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+--- /dev/null
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++++ b/libc/sysdeps/linux/i386/s_copysignf.S
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+@@ -0,0 +1,25 @@
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++/*
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++ * Written by J.T. Conklin <[email protected]>.
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++ * Public domain.
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++ */
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++
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++#define _ERRNO_H 1
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++#include <features.h>
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++#include <bits/errno.h>
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++
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++.text
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++.global copysignf
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++.type copysignf,%function
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++copysignf:
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++ movl 8(%esp),%edx
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++ movl 4(%esp),%eax
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++ andl $0x80000000,%edx
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++ andl $0x7fffffff,%eax
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++ orl %edx,%eax
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++ movl %eax,4(%esp)
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++ flds 4(%esp)
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++ ret
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++.size copysignf,.-copysignf
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++
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++libc_hidden_def(copysignf)
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++
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+--- /dev/null
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++++ b/libc/sysdeps/linux/i386/s_copysignl.S
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+@@ -0,0 +1,26 @@
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++/*
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++ * Written by J.T. Conklin <[email protected]>.
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++ * Changes for long double by Ulrich Drepper <[email protected]>
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++ * Public domain.
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++ */
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++
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++#define _ERRNO_H 1
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++#include <features.h>
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++#include <bits/errno.h>
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++
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++.text
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++.global copysignl
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++.type copysignl,%function
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++copysignl:
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++ movl 24(%esp),%edx
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++ movl 12(%esp),%eax
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++ andl $0x8000,%edx
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++ andl $0x7fff,%eax
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++ orl %edx,%eax
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++ movl %eax,12(%esp)
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++ fldt 4(%esp)
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++ ret
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++.size copysignl,.-copysignl
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++
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++libc_hidden_def(copysignl)
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++
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Felix Fietkau