[PATCH v3 12/14] read-cache.c: reduce branching based on HAVE_THREADS

[Nguyễn Thái Ngọc Duy]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 read-cache.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index 40fc0cb65f..00cd416816 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2172,7 +2172,6 @@ int do_read_index(struct index_state *istate, const char 
*path, int must_exist)
 
        src_offset = sizeof(*hdr);
 
-       if (HAVE_THREADS) {
        nr_threads = git_config_get_index_threads();
 
        /* TODO: does creating more threads than cores help? */
@@ -2183,6 +2182,9 @@ int do_read_index(struct index_state *istate, const char 
*path, int must_exist)
                        nr_threads = cpus;
        }
 
+       if (!HAVE_THREADS)
+               nr_threads = 1;
+
        if (nr_threads > 1) {
                extension_offset = read_eoie_extension(mmap, mmap_size);
                if (extension_offset) {
@@ -2210,20 +2212,16 @@ int do_read_index(struct index_state *istate, const 
char *path, int must_exist)
        } else {
                src_offset += load_all_cache_entries(istate, mmap, mmap_size, 
src_offset);
        }
-       } else {
-               src_offset += load_all_cache_entries(istate, mmap, mmap_size, 
src_offset);
-       }
 
        istate->timestamp.sec = st.st_mtime;
        istate->timestamp.nsec = ST_MTIME_NSEC(st);
 
        /* if we created a thread, join it otherwise load the extensions on the 
primary thread */
-       if (HAVE_THREADS && extension_offset) {
+       if (extension_offset) {
                int ret = pthread_join(p.pthread, NULL);
                if (ret)
                        die(_("unable to join load_index_extensions thread: 
%s"), strerror(ret));
-       }
-       if (!extension_offset) {
+       } else {
                p.src_offset = src_offset;
                load_index_extensions(&p);
        }
@@ -2745,8 +2743,10 @@ static int do_write_index(struct index_state *istate, 
struct tempfile *tempfile,
        if (ce_write(&c, newfd, &hdr, sizeof(hdr)) < 0)
                return -1;
 
-       if (HAVE_THREADS) {
+       if (HAVE_THREADS)
                nr_threads = git_config_get_index_threads();
+       else
+               nr_threads = 1;
 
        if (nr_threads != 1) {
                int ieot_blocks, cpus;
@@ -2777,7 +2777,6 @@ static int do_write_index(struct index_state *istate, 
struct tempfile *tempfile,
                        ieot_entries = DIV_ROUND_UP(entries, ieot_blocks);
                }
        }
-       }
 
        offset = lseek(newfd, 0, SEEK_CUR);
        if (offset < 0) {
@@ -2861,7 +2860,7 @@ static int do_write_index(struct index_state *istate, 
struct tempfile *tempfile,
         * strip_extensions parameter as we need it when loading the shared
         * index.
         */
-       if (HAVE_THREADS && ieot) {
+       if (ieot) {
                struct strbuf sb = STRBUF_INIT;
 
                write_ieot_extension(&sb, ieot);
-- 
2.19.1.1005.gac84295441