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*.c *_init(): define in terms of corresponding *_INIT macro

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Change the common patter in the codebase of duplicating the
initialization logic between an *_INIT macro and a
corresponding *_init() function to use the macro as the canonical
source of truth.

Now we no longer need to keep the function up-to-date with the macro
version. This implements a suggestion by Jeff King who found that
under -O2 [1] modern compilers will init new version in place without
the extra copy[1]. The performance of a single *_init() won't matter
in most cases, but even if it does we're going to be producing
efficient machine code to perform these operations.

1. https://lore.kernel.org/git/YNyrDxUO1PlGJvCn@coredump.intra.peff.net/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason
2021-07-01 12:51:26 +02:00
committed by Junio C Hamano
parent 3d97ea479f
commit 5726a6b401
6 changed files with 12 additions and 15 deletions
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4
strbuf.c
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@ -52,8 +52,8 @@ char strbuf_slopbuf[1];
void strbuf_init(struct strbuf *sb, size_t hint)
{
sb->alloc = sb->len = 0;
sb->buf = strbuf_slopbuf;
struct strbuf blank = STRBUF_INIT;
memcpy(sb, &blank, sizeof(*sb));
if (hint)
strbuf_grow(sb, hint);
}