From 94c1addf862619250a1584c05a43f80f1c8d7d72 Mon Sep 17 00:00:00 2001 From: Taylor Blau Date: Thu, 23 May 2024 17:27:18 -0400 Subject: [PATCH] ewah: `bitmap_equals_ewah()` Prepare to reuse existing pseudo-merge bitmaps by implementing a `bitmap_equals_ewah()` helper. This helper will be used to see if a raw bitmap (containing the set of parents for some pseudo-merge) is equal to any existing pseudo-merge's commits bitmap (which are stored as EWAH-compressed bitmaps on disk). Signed-off-by: Taylor Blau Signed-off-by: Junio C Hamano --- ewah/bitmap.c | 19 +++++++++++++++++++ ewah/ewok.h | 1 + 2 files changed, 20 insertions(+) diff --git a/ewah/bitmap.c b/ewah/bitmap.c index dc2ca190f1..55928dada8 100644 --- a/ewah/bitmap.c +++ b/ewah/bitmap.c @@ -261,6 +261,25 @@ int bitmap_equals(struct bitmap *self, struct bitmap *other) return 1; } +int bitmap_equals_ewah(struct bitmap *self, struct ewah_bitmap *other) +{ + struct ewah_iterator it; + eword_t word; + size_t i = 0; + + ewah_iterator_init(&it, other); + + while (ewah_iterator_next(&word, &it)) + if (word != (i < self->word_alloc ? self->words[i++] : 0)) + return 0; + + for (; i < self->word_alloc; i++) + if (self->words[i]) + return 0; + + return 1; +} + int bitmap_is_subset(struct bitmap *self, struct bitmap *other) { size_t common_size, i; diff --git a/ewah/ewok.h b/ewah/ewok.h index 7074a6347b..5e357e2493 100644 --- a/ewah/ewok.h +++ b/ewah/ewok.h @@ -179,6 +179,7 @@ void bitmap_unset(struct bitmap *self, size_t pos); int bitmap_get(struct bitmap *self, size_t pos); void bitmap_free(struct bitmap *self); int bitmap_equals(struct bitmap *self, struct bitmap *other); +int bitmap_equals_ewah(struct bitmap *self, struct ewah_bitmap *other); /* * Both `bitmap_is_subset()` and `ewah_bitmap_is_subset()` return 1 if the set