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0de26fd78e
Zlib-ng is zlib replacement with optimizations for "next generation" systems. Its optimization may benifits image library decode and encode speed such as libpng. In our tests, if using zlib-ng and libpng combination on a x86_64 machine with AVX2, the time of `imdecode` amd `imencode` will drop 20% approximately. This patch enables zlib-ng's optimization if `CV_DISABLE_OPTIMIZATION` is OFF. Since Zlib-ng can dispatch intrinsics on the fly, port work is much easier. Related discussion: https://github.com/opencv/opencv/issues/22573
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/auxv.h>
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#include <sys/utsname.h>
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#include "../../zbuild.h"
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#include "riscv_features.h"
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#define ISA_V_HWCAP (1 << ('v' - 'a'))
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int Z_INTERNAL is_kernel_version_greater_or_equal_to_6_5() {
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struct utsname buffer;
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uname(&buffer);
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int major, minor;
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if (sscanf(buffer.release, "%d.%d", &major, &minor) != 2) {
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// Something bad with uname()
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return 0;
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}
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if (major > 6 || major == 6 && minor >= 5)
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return 1;
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return 0;
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}
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void Z_INTERNAL riscv_check_features_compile_time(struct riscv_cpu_features *features) {
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#if defined(__riscv_v) && defined(__linux__)
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features->has_rvv = 1;
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#else
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features->has_rvv = 0;
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#endif
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}
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void Z_INTERNAL riscv_check_features_runtime(struct riscv_cpu_features *features) {
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unsigned long hw_cap = getauxval(AT_HWCAP);
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features->has_rvv = hw_cap & ISA_V_HWCAP;
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}
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void Z_INTERNAL riscv_check_features(struct riscv_cpu_features *features) {
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if (is_kernel_version_greater_or_equal_to_6_5())
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riscv_check_features_runtime(features);
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else
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riscv_check_features_compile_time(features);
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}
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