https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65076
Bug ID: 65076
Summary: [5 Regression] 16% tramp3d-v4.cpp compile time
regression
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: trippels at gcc dot gnu.org
CC: hubicka at gcc dot gnu.org
Trunk build with --enable-checking=release and LTO/PGO is currently
~16% slower when compiling tramp3d-v4.cpp compared to 4.9.:
Trunk:
markus@x4 ~ % time g++ -w -Ofast tramp3d-v4.cpp
g++ -w -Ofast tramp3d-v4.cpp 25.92s user 0.35s system 99% cpu 26.303 total
4.9:
markus@x4 ~ % time g++ -w -Ofast tramp3d-v4.cpp
g++ -w -Ofast tramp3d-v4.cpp 21.56s user 0.36s system 99% cpu 21.963 total
It looks like r219452 is the culprit.
phase opt and generate : 19.43 (87%) usr 1.44 (71%) sys 20.88 (85%) wall
674052 kB (64%) ggc
vs.
phase opt and generate : 23.69 (89%) usr 1.51 (70%) sys 25.20 (87%) wall
710029 kB (66%) ggc
