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Fix BITMAP_USE_TREE version of bitmap_ffu().

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This fixes an extent searching regression on 32-bit systems, caused by
the initial bitmap_ffu() implementation in
c8021d01f6 (Implement bitmap_ffu(), which
finds the first unset bit.), as first used in
5d33233a5e (Use a bitmap in extents_t to
speed up search.).
This commit is contained in:
Jason Evans
2017-03-24 22:46:56 -07:00
parent e6b074472e
commit 5e12223925
2 changed files with 48 additions and 5 deletions
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40
test/unit/bitmap.c
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@@ -273,7 +273,7 @@ TEST_BEGIN(test_bitmap_unset) {
TEST_END
static void
test_bitmap_sfu_body(const bitmap_info_t *binfo, size_t nbits) {
test_bitmap_xfu_body(const bitmap_info_t *binfo, size_t nbits) {
bitmap_t *bitmap = (bitmap_t *)malloc(bitmap_size(binfo));
assert_ptr_not_null(bitmap, "Unexpected malloc() failure");
bitmap_init(bitmap, binfo, false);
@@ -342,20 +342,50 @@ test_bitmap_sfu_body(const bitmap_info_t *binfo, size_t nbits) {
assert_zu_eq(bitmap_sfu(bitmap, binfo), nbits - 1,
"First unset bit should be the last bit");
assert_true(bitmap_full(bitmap, binfo), "All bits should be set");
/*
* Bubble a "usu" pattern through the bitmap and verify that
* bitmap_ffu() finds the correct bit for all five min_bit cases.
*/
if (nbits >= 3) {
for (size_t i = 0; i < nbits-2; i++) {
bitmap_unset(bitmap, binfo, i);
bitmap_unset(bitmap, binfo, i+2);
if (i > 0) {
assert_zu_eq(bitmap_ffu(bitmap, binfo, i-1), i,
"Unexpected first unset bit");
}
assert_zu_eq(bitmap_ffu(bitmap, binfo, i), i,
"Unexpected first unset bit");
assert_zu_eq(bitmap_ffu(bitmap, binfo, i+1), i+2,
"Unexpected first unset bit");
assert_zu_eq(bitmap_ffu(bitmap, binfo, i+2), i+2,
"Unexpected first unset bit");
if (i + 3 < nbits) {
assert_zu_eq(bitmap_ffu(bitmap, binfo, i+3),
nbits, "Unexpected first unset bit");
}
assert_zu_eq(bitmap_sfu(bitmap, binfo), i,
"Unexpected first unset bit");
assert_zu_eq(bitmap_sfu(bitmap, binfo), i+2,
"Unexpected first unset bit");
}
}
free(bitmap);
}
TEST_BEGIN(test_bitmap_sfu) {
TEST_BEGIN(test_bitmap_xfu) {
size_t nbits;
for (nbits = 1; nbits <= BITMAP_MAXBITS; nbits++) {
bitmap_info_t binfo;
bitmap_info_init(&binfo, nbits);
test_bitmap_sfu_body(&binfo, nbits);
test_bitmap_xfu_body(&binfo, nbits);
}
#define NB(nbits) { \
bitmap_info_t binfo = BITMAP_INFO_INITIALIZER(nbits); \
test_bitmap_sfu_body(&binfo, nbits); \
test_bitmap_xfu_body(&binfo, nbits); \
}
NBITS_TAB
#undef NB
@@ -370,5 +400,5 @@ main(void) {
test_bitmap_init,
test_bitmap_set,
test_bitmap_unset,
test_bitmap_sfu);
test_bitmap_xfu);
}