https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87615
Bug ID: 87615
Summary: Possible excessive compile time with -O2
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
Created attachment 44842
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44842&action=edit
gzipped C source code
The attached C code, when compiled by a release version
of recent gcc trunk, and flag -O2, seems to take about nine
minutes 50 seconds to compile.
According to -ftime-report,
phase opt and generate : 511.78 (100%) 2.60 ( 69%) 518.59 (100%)
474628 kB ( 92%)
alias stmt walking : 265.80 ( 52%) 0.41 ( 11%) 267.65 ( 51%)
3 kB ( 0%)
tree VRP : 90.34 ( 18%) 0.18 ( 5%) 91.33 ( 18%)
58202 kB ( 11%)
tree FRE : 86.43 ( 17%) 1.22 ( 32%) 88.79 ( 17%)
1833 kB ( 0%)
$ ~/gcc/results.265139.release/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/home/dcb/gcc/results.265139.release/bin/gcc
COLLECT_LTO_WRAPPER=/home/dcb/gcc/results.265139.release/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../trunk/configure
--prefix=/home/dcb/gcc/results.265139.release --disable-bootstrap
--disable-multilib --disable-werror --enable-checking=release
--enable-languages=c,c++,fortran
Thread model: posix
gcc version 9.0.0 20181013 (experimental) (GCC)
$
