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Remove all the special-case code for INT64_IS_BUSTED, per decision that

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we're not going to support that anymore.

I did keep the 64-bit-CRC-with-32-bit-arithmetic code, since it has a
performance excuse to live.  It's a bit moot since that's all ifdef'd
out, of course.
This commit is contained in:
Tom Lane
2010-01-07 04:53:35 +00:00
parent c282b36dd2
commit 901be0fad4
16 changed files with 45 additions and 203 deletions
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20
src/include/utils/pg_crc.h
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@ -17,7 +17,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/pg_crc.h,v 1.22 2010/01/02 16:58:10 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/pg_crc.h,v 1.23 2010/01/07 04:53:35 tgl Exp $
*/
#ifndef PG_CRC_H
#define PG_CRC_H
@ -60,15 +60,14 @@ extern CRCDLLIMPORT const uint32 pg_crc32_table[];
#ifdef PROVIDE_64BIT_CRC
/*
* If we have a 64-bit integer type, then a 64-bit CRC looks just like the
* usual sort of implementation. If we have no working 64-bit type, then
* fake it with two 32-bit registers. (Note: experience has shown that the
* two-32-bit-registers code is as fast as, or even much faster than, the
* 64-bit code on all but true 64-bit machines. INT64_IS_BUSTED is therefore
* probably the wrong control symbol to use to select the implementation.)
* If we use a 64-bit integer type, then a 64-bit CRC looks just like the
* usual sort of implementation. However, we can also fake it with two
* 32-bit registers. Experience has shown that the two-32-bit-registers code
* is as fast as, or even much faster than, the 64-bit code on all but true
* 64-bit machines. We use SIZEOF_VOID_P to check the native word width.
*/
#ifdef INT64_IS_BUSTED
#if SIZEOF_VOID_P < 8
/*
* crc0 represents the LSBs of the 64-bit value, crc1 the MSBs. Note that
@ -114,7 +113,8 @@ do { \
/* Constant table for CRC calculation */
extern CRCDLLIMPORT const uint32 pg_crc64_table0[];
extern CRCDLLIMPORT const uint32 pg_crc64_table1[];
#else /* int64 works */
#else /* use int64 implementation */
typedef struct pg_crc64
{
@ -147,7 +147,7 @@ do { \
/* Constant table for CRC calculation */
extern CRCDLLIMPORT const uint64 pg_crc64_table[];
#endif /* INT64_IS_BUSTED */
#endif /* SIZEOF_VOID_P < 8 */
#endif /* PROVIDE_64BIT_CRC */
#endif /* PG_CRC_H */