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Speed up 'replace-buffer-contents' some more

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* src/editfns.c (EXTRA_CONTEXT_FIELDS): New members beg_a and beg_b.
(Freplace_buffer_contents): Set up ctx.beg_a and ctx.beg_b.
(buffer_chars_equal): Use ctx->beg_a and ctx->beg_b instead of
calling BUF_BEGV, which is expensive.  This speeds up the recipe
in bug#31888 by 30%.
This commit is contained in:
Eli Zaretskii 2018-07-03 22:16:20 +03:00
parent 00fdce071c
commit 0dce5e5920
1 changed files with 7 additions and 2 deletions
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9
src/editfns.c
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@ -3127,6 +3127,9 @@ static unsigned short rbc_quitcounter;
/* Buffers to compare. */ \
struct buffer *buffer_a; \
struct buffer *buffer_b; \
/* BEGV of each buffer */ \
ptrdiff_t beg_a; \
ptrdiff_t beg_b; \
/* Whether each buffer is unibyte/plain-ASCII or not. */ \
bool a_unibyte; \
bool b_unibyte; \
@ -3208,6 +3211,8 @@ differences between the two buffers. */)
struct context ctx = {
.buffer_a = a,
.buffer_b = b,
.beg_a = min_a,
.beg_b = min_b,
.a_unibyte = BUF_ZV (a) == BUF_ZV_BYTE (a),
.b_unibyte = BUF_ZV (b) == BUF_ZV_BYTE (b),
.deletions = SAFE_ALLOCA (del_bytes),
@ -3349,8 +3354,8 @@ static bool
buffer_chars_equal (struct context *ctx,
ptrdiff_t pos_a, ptrdiff_t pos_b)
{
pos_a += BUF_BEGV (ctx->buffer_a);
pos_b += BUF_BEGV (ctx->buffer_b);
pos_a += ctx->beg_a;
pos_b += ctx->beg_b;
/* Allow the user to escape out of a slow compareseq call. */
rarely_quit (++rbc_quitcounter);