https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71148
Bug ID: 71148
Summary: [7 Regression] Compile time hog w/ -O3 -funroll-loops
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Keywords: compile-time-hog
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
It take indefinite (or very long?) time for gcc-7.0.0-alpha20160515 to compile
the following snippet w/ -O3 -funroll-loops:
int rh, ok, kq, fu;
void
js (int cs)
{
rh = fu;
if (fu != 0)
{
cs /= 3;
if (cs <= 0)
{
int z9;
for (z9 = 0; z9 < 2; ++z9)
{
z9 += cs;
ok += z9;
fu += ok;
}
}
}
}
void
vy (int s3)
{
int yo, g2 = 0;
sd:
js (g2);
for (yo = 0; yo < 2; ++yo)
{
if (fu != 0)
goto sd;
kq += (s3 != (g2 ? s3 : 0));
for (s3 = 0; s3 < 72; ++s3)
g2 *= (~0 - 1);
g2 -= yo;
}
for (fu = 0; fu < 18; ++fu)
for (yo = 0; yo < 17; ++yo)
if (g2 < 0)
goto sd;
}
et_splay(et_occ *) is the absolute leader in perf top w/ 32%, almost like in
PR51005.
