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authorDamjan Marion <damarion@cisco.com>2018-05-10 13:40:44 +0200
committerDave Barach <openvpp@barachs.net>2018-05-10 17:16:56 +0000
commit1105600416e0560cb05120a22e0a2e7359a13665 (patch)
treeacf1df08de42344c380473d81886864e662890cf /src/svm/svm.c
parent132dc49ee847a3e3b644de8b36499d73e8a8d37e (diff)
vppinfra: use count_trailing_zeros in sparse_vec_index
It is much cheaper to use ctzll than to do shift,subtract and mask in likely case when we are looking for 1st set bit in the uword. Change-Id: I31954081571978878c7098bafad0c85a91755fa2 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/svm/svm.c')
-rw-r--r--src/svm/svm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/svm/svm.c b/src/svm/svm.c
index 16a58fa126a..e3a734cbc84 100644
--- a/src/svm/svm.c
+++ b/src/svm/svm.c
@@ -83,7 +83,7 @@ svm_get_global_region_base_va ()
unformat_free (&input);
close (fd);
- count_leading_zeros (bits, end);
+ bits = count_leading_zeros (end);
bits = 64 - bits;
if (bits >= 36 && bits <= 48)
return ((1ul << bits) / 4) - (2 * SVM_GLOBAL_REGION_SIZE);