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https://github.com/simdjson/simdjson
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strager
5510089d45
* Rename simdjson_really_inline -> simdjson_inline I want to change the simdjson_really_inline macro to sometimes not force inlining. After that upcoming change, the name simdjson_really_inline will no longer makes sense. Rename simdjson_really_inline to simdjson_inline. This patch should not change semantics; simdjson_inline still forces inlining as before. Some functions still need to be really inlined for ABI reasons. (GCC's -Wpsabi complains otherwise.) Leave those functions marked as simdjson_really_inline. * Improve build times for debug builds simdjson_inline is used for most simdjson functions. It forces inlining. In unoptimized/debug builds, this can lead to a lot of machine code being generated (especially with Address Sanitizer), causing slow compilation. Change simdjson_inline to force inlining only for optimized builds. Sometimes, the programmer might want a slightly-optimized build and want fast compilation (e.g. GCC's -Og mode). Allow simdjson users to define the simdjson_inline macro themselves (e.g. on the command line: -Dsimdjson_inline=inline) in cases where the default behavior is undesired. This patch reduced build times by over 75% for ondemand_object_tests.cpp with GCC 9.4.0 and CMAKE_BUILD_TYPE=Debug on my AMD 5950X: Before: 6.885 6.683 6.971 6.957 6.949 seconds (5 samples) After: 1.492 1.551 1.494 1.490 1.531 seconds (5 samples)
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
#ifndef SIMDJSON_FALLBACK_BITMANIPULATION_H
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#define SIMDJSON_FALLBACK_BITMANIPULATION_H
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#include "simdjson/base.h"
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#include <limits>
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namespace simdjson {
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namespace SIMDJSON_IMPLEMENTATION {
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namespace {
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#if defined(_MSC_VER) && !defined(_M_ARM64) && !defined(_M_X64)
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static inline unsigned char _BitScanForward64(unsigned long* ret, uint64_t x) {
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unsigned long x0 = (unsigned long)x, top, bottom;
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_BitScanForward(&top, (unsigned long)(x >> 32));
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_BitScanForward(&bottom, x0);
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*ret = x0 ? bottom : 32 + top;
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return x != 0;
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}
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static unsigned char _BitScanReverse64(unsigned long* ret, uint64_t x) {
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unsigned long x1 = (unsigned long)(x >> 32), top, bottom;
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_BitScanReverse(&top, x1);
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_BitScanReverse(&bottom, (unsigned long)x);
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*ret = x1 ? top + 32 : bottom;
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return x != 0;
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}
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#endif
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/* result might be undefined when input_num is zero */
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simdjson_inline int leading_zeroes(uint64_t input_num) {
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#ifdef _MSC_VER
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unsigned long leading_zero = 0;
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// Search the mask data from most significant bit (MSB)
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// to least significant bit (LSB) for a set bit (1).
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if (_BitScanReverse64(&leading_zero, input_num))
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return (int)(63 - leading_zero);
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else
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return 64;
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#else
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return __builtin_clzll(input_num);
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#endif// _MSC_VER
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}
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} // unnamed namespace
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} // namespace SIMDJSON_IMPLEMENTATION
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} // namespace simdjson
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#endif // SIMDJSON_FALLBACK_BITMANIPULATION_H
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