remove compare and branch in fast path for c++ operator delete[]

Summary: sdallocx is checking a flag that will never be set (at least in the provided C++ destructor implementation). This branch will probably only rarely be mispredicted however it removes two instructions in sdallocx and one at the callsite (to zero out flags).
2019-03-08 11:50:30 -08:00
parent c2a3a7cd3f
commit d3d7a8ef09
4 changed files with 17 additions and 3 deletions
--- a/bin/jeprof.in
+++ b/bin/jeprof.in
@@ -2909,6 +2909,7 @@ sub RemoveUninterestingFrames {
                      '@JEMALLOC_PREFIX@xallocx',
                      '@JEMALLOC_PREFIX@dallocx',
                      '@JEMALLOC_PREFIX@sdallocx',
+                      '@JEMALLOC_PREFIX@sdallocx_noflags',
                      'tc_calloc',
                      'tc_cfree',
                      'tc_malloc',