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Use bitwise rotate functions in more places

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There were a number of places in the code that used bespoke bit-twiddling
expressions to do bitwise rotation. While we've had pg_rotate_right32()
for a while now, we hadn't gotten around to standardizing on that. Do so
now. Since many potential call sites look more natural with the "left"
equivalent, add that function too.

Reviewed by Tom Lane and Yugo Nagata

Discussion:
https://www.postgresql.org/message-id/CAFBsxsH7c1LC0CGZ0ADCBXLHU5-%3DKNXx-r7tHYPAW51b2HK4Qw%40mail.gmail.com
This commit is contained in:
John Naylor
2022-02-20 13:22:08 +07:00
parent d7a978601d
commit 4b35408f1e
9 changed files with 28 additions and 25 deletions
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4
src/common/hashfn.c
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@ -24,6 +24,7 @@
#include "postgres.h"
#include "common/hashfn.h"
#include "port/pg_bitutils.h"
/*
@ -44,8 +45,7 @@
/* Get a bit mask of the bits set in non-uint32 aligned addresses */
#define UINT32_ALIGN_MASK (sizeof(uint32) - 1)
/* Rotate a uint32 value left by k bits - note multiple evaluation! */
#define rot(x,k) (((x)<<(k)) | ((x)>>(32-(k))))
#define rot(x,k) pg_rotate_left32(x, k)
/*----------
* mix -- mix 3 32-bit values reversibly.