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eb9aa96fac
Both symbols are marked as legacy in POSIX.1-2001 and removed on
POSIX.1-2008, although the prototypes are defined for _GNU_SOURCE
or _DEFAULT_SOURCE.
GCC also replaces bcopy with a memmove and bzero with memset on default
configuration (to actually get a bzero libc call the code requires
to omit string.h inclusion and built with -fno-builtin), so it is
highly unlikely programs are actually calling libc bzero symbol.
On a recent Linux distro (Ubuntu 22.04), there is no bzero calls
by the installed binaries.
$ cat count_bstring.sh
#!/bin/bash
files=`IFS=':';for i in $PATH; do test -d "$i" && find "$i" -maxdepth 1 -executable -type f; done`
total=0
for file in $files; do
symbols=`objdump -R $file 2>&1`
if [ $? -eq 0 ]; then
ncalls=`echo $symbols | grep -w $1 | wc -l`
((total=total+ncalls))
if [ $ncalls -gt 0 ]; then
echo "$file: $ncalls"
fi
fi
done
echo "TOTAL=$total"
$ ./count_bstring.sh bzero
TOTAL=0
Checked on x86_64-linux-gnu.
(cherry picked from commit 9403b71ae9)
39 lines
886 B
ArmAsm
39 lines
886 B
ArmAsm
#if IS_IN (libc)
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# define USE_WITH_AVX2 1
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# define VEC_SIZE 32
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# define MOV_SIZE 4
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# define RET_SIZE 4
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# define VEC(i) ymm##i
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# define VMOVU vmovdqu
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# define VMOVA vmovdqa
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# define MEMSET_SET_VEC0_AND_SET_RETURN(d, r) \
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vmovd d, %xmm0; \
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movq r, %rax;
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# define WMEMSET_SET_VEC0_AND_SET_RETURN(d, r) \
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MEMSET_SET_VEC0_AND_SET_RETURN(d, r)
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# define MEMSET_VDUP_TO_VEC0_HIGH() vpbroadcastb %xmm0, %ymm0
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# define MEMSET_VDUP_TO_VEC0_LOW() vpbroadcastb %xmm0, %xmm0
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# define WMEMSET_VDUP_TO_VEC0_HIGH() vpbroadcastd %xmm0, %ymm0
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# define WMEMSET_VDUP_TO_VEC0_LOW() vpbroadcastd %xmm0, %xmm0
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# ifndef SECTION
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# define SECTION(p) p##.avx
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# endif
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# ifndef MEMSET_SYMBOL
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# define MEMSET_SYMBOL(p,s) p##_avx2_##s
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# endif
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# ifndef WMEMSET_SYMBOL
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# define WMEMSET_SYMBOL(p,s) p##_avx2_##s
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# endif
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# define USE_XMM_LESS_VEC
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# include "memset-vec-unaligned-erms.S"
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#endif
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