upstream/mercurial-mirror Files · mercurial/bitmanipulation.h

branchmap: avoid ancestor computations in absence of non-continous branches...

branchmap: avoid ancestor computations in absence of non-continous branches The branchhead computation is one of the more heavy operations for bigger repositories as it has to scan all changesets and potentially involves the expensive computation of the ancestor sets. Redo the computation to handle the common cases directly and use tighter conditions for when the ancestor scan is necessary. Most importantly, avoid it completely if the non-continous branches are processed in one update as seen in the initial computation after a clone. For the Mercurial repository, it gives a small 2-3% performance boost. For the NetBSD test repository, it cuts the time in half. Differential Revision: https://phab.mercurial-scm.org/D9631

Augie Fackler - - Load All Authors

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        Maciej Fijalkowski
    
internals: move the bitmanipulation routines into its own file...

              r29444
            
      #ifndef _HG_BITMANIPULATION_H_

      #define _HG_BITMANIPULATION_H_

        Martin von Zweigbergk
    
bitmanipulation: add missing include of string.h...

              r32646
            
      #include <string.h>

        Maciej Fijalkowski
    
internals: move the bitmanipulation routines into its own file...

              r29444
            
      #include "compat.h"

      static inline uint32_t getbe32(const char *c)

      {

      	const unsigned char *d = (const unsigned char *)c;

        Augie Fackler
    
bitmanipulation: fix undefined behavior in bit shift in getbe32...

              r38322
            
      	return ((((uint32_t)d[0]) << 24) | (((uint32_t)d[1]) << 16) |

      	        (((uint32_t)d[2]) << 8) | (d[3]));

        Maciej Fijalkowski
    
internals: move the bitmanipulation routines into its own file...

              r29444
            
      }

      static inline int16_t getbeint16(const char *c)

      {

      	const unsigned char *d = (const unsigned char *)c;

        Augie Fackler
    
bitmanipulation: reformat with clang-format...

              r34698
            
      	return ((d[0] << 8) | (d[1]));

        Maciej Fijalkowski
    
internals: move the bitmanipulation routines into its own file...

              r29444
            
      }

      static inline uint16_t getbeuint16(const char *c)

      {

      	const unsigned char *d = (const unsigned char *)c;

        Augie Fackler
    
bitmanipulation: reformat with clang-format...

              r34698
            
      	return ((d[0] << 8) | (d[1]));

        Maciej Fijalkowski
    
internals: move the bitmanipulation routines into its own file...

              r29444
            
      }

      static inline void putbe32(uint32_t x, char *c)

      {

      	c[0] = (x >> 24) & 0xff;

      	c[1] = (x >> 16) & 0xff;

      	c[2] = (x >> 8) & 0xff;

        Augie Fackler
    
bitmanipulation: reformat with clang-format...

              r34698
            
      	c[3] = (x)&0xff;

        Maciej Fijalkowski
    
internals: move the bitmanipulation routines into its own file...

              r29444
            
      }

      static inline double getbefloat64(const char *c)

      {

      	const unsigned char *d = (const unsigned char *)c;

      	double ret;

      	int i;

      	uint64_t t = 0;

      	for (i = 0; i < 8; i++) {

        Augie Fackler
    
bitmanipulation: reformat with clang-format...

              r34698
            
      		t = (t << 8) + d[i];

        Maciej Fijalkowski
    
internals: move the bitmanipulation routines into its own file...

              r29444
            
      	}

      	memcpy(&ret, &t, sizeof(t));

      	return ret;

      }

      #endif

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Maciej Fijalkowski internals: move the bitmanipulation routines into its own file...	r29444	#ifndef _HG_BITMANIPULATION_H_
		#define _HG_BITMANIPULATION_H_

Martin von Zweigbergk bitmanipulation: add missing include of string.h...	r32646	#include <string.h>

Maciej Fijalkowski internals: move the bitmanipulation routines into its own file...	r29444	#include "compat.h"

		static inline uint32_t getbe32(const char *c)
		{
		const unsigned char d = (const unsigned char )c;

Augie Fackler bitmanipulation: fix undefined behavior in bit shift in getbe32...	r38322	return ((((uint32_t)d[0]) << 24) \| (((uint32_t)d[1]) << 16) \|
		(((uint32_t)d[2]) << 8) \| (d[3]));
Maciej Fijalkowski internals: move the bitmanipulation routines into its own file...	r29444	}

		static inline int16_t getbeint16(const char *c)
		{
		const unsigned char d = (const unsigned char )c;

Augie Fackler bitmanipulation: reformat with clang-format...	r34698	return ((d[0] << 8) \| (d[1]));
Maciej Fijalkowski internals: move the bitmanipulation routines into its own file...	r29444	}

		static inline uint16_t getbeuint16(const char *c)
		{
		const unsigned char d = (const unsigned char )c;

Augie Fackler bitmanipulation: reformat with clang-format...	r34698	return ((d[0] << 8) \| (d[1]));
Maciej Fijalkowski internals: move the bitmanipulation routines into its own file...	r29444	}

		static inline void putbe32(uint32_t x, char *c)
		{
		c[0] = (x >> 24) & 0xff;
		c[1] = (x >> 16) & 0xff;
		c[2] = (x >> 8) & 0xff;
Augie Fackler bitmanipulation: reformat with clang-format...	r34698	c[3] = (x)&0xff;
Maciej Fijalkowski internals: move the bitmanipulation routines into its own file...	r29444	}

		static inline double getbefloat64(const char *c)
		{
		const unsigned char d = (const unsigned char )c;
		double ret;
		int i;
		uint64_t t = 0;
		for (i = 0; i < 8; i++) {
Augie Fackler bitmanipulation: reformat with clang-format...	r34698	t = (t << 8) + d[i];
Maciej Fijalkowski internals: move the bitmanipulation routines into its own file...	r29444	}
		memcpy(&ret, &t, sizeof(t));
		return ret;
		}

		#endif