[S] Change in osmo-pcu[master]: Document pcu_lsb() function

pespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-pcu/+/33125 ) Change subject: Document pcu_lsb() function ...................................................................... Document pcu_lsb() function While at it, fix a typo in the test output. This function is nowadays only used in ms_current_pacch_slots(), which is used only to print the PACCH TS (the first common UL & DL TS). Change-Id: Id1d0b681f6866618f9f3a8c64d6a6c809ca50ea7 --- M src/pcu_utils.h M tests/types/TypesTest.cpp M tests/types/TypesTest.ok 3 files changed, 20 insertions(+), 3 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-pcu refs/changes/25/33125/1 diff --git a/src/pcu_utils.h b/src/pcu_utils.h index 2dd86ac..1b1bf06 100644 --- a/src/pcu_utils.h +++ b/src/pcu_utils.h @@ -72,6 +72,9 @@ return __builtin_popcountll(x); } +/* Trim all 1 bits except the Least Significat Bit, which is kept. + * equivalent of (1 << ffs(u)) / 2 + */ static inline uint8_t pcu_lsb(uint8_t x) { return x & -x; diff --git a/tests/types/TypesTest.cpp b/tests/types/TypesTest.cpp index 871e0d1..0d936de 100644 --- a/tests/types/TypesTest.cpp +++ b/tests/types/TypesTest.cpp @@ -937,10 +937,10 @@ { uint8_t u = 0; - printf("Testing LBS utility...\n"); + printf("Testing LSB utility...\n"); do { - uint8_t x = pcu_lsb(u); /* equivalent of (1 << ffs(u)) / 2 */ + uint8_t x = pcu_lsb(u); printf("%2X " OSMO_BIT_SPEC ": {%d} %3d\n", u, OSMO_BIT_PRINT(u), pcu_bitcount(u), x); u++; diff --git a/tests/types/TypesTest.ok b/tests/types/TypesTest.ok index 27afc71..b99e17e 100644 --- a/tests/types/TypesTest.ok +++ b/tests/types/TypesTest.ok @@ -18,7 +18,7 @@ 06 3f 10 0d 23 6d 7f 03 18 23 00 46 a0 08 00 17 44 0b 2b 2b 2b 2b 2b assignment reject: 06 3a 10 7f 06 36 14 7f 06 36 14 7f 06 36 14 7f 06 36 14 c0 2b 2b assignment reject: 06 3a 10 70 06 36 14 70 06 36 14 70 06 36 14 70 06 36 14 0b 2b 2b -Testing LBS utility... +Testing LSB utility... 0 ........: {0} 0 1 .......1: {1} 1 2 ......1.: {1} 2 -- To view, visit https://gerrit.osmocom.org/c/osmo-pcu/+/33125 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-pcu Gerrit-Branch: master Gerrit-Change-Id: Id1d0b681f6866618f9f3a8c64d6a6c809ca50ea7 Gerrit-Change-Number: 33125 Gerrit-PatchSet: 1 Gerrit-Owner: pespin &lt;pespin(a)sysmocom.de&gt; Gerrit-Reviewer: Jenkins Builder Gerrit-MessageType: newchange