[Bug tree-optimization/71288] New: [7 Regression] Time and memory hog during if-conversion at -O3
asolokha at gmx dot com
gcc-bugzilla@gcc.gnu.org
Thu May 26 11:03:00 GMT 2016
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71288
Bug ID: 71288
Summary: [7 Regression] Time and memory hog during
if-conversion at -O3
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Keywords: compile-time-hog, memory-hog
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
gcc-7.0.0-alpha20160522 consumes lots of memory and time (indefinite time?)
when compiling the following testcase at -O3:
unsigned short int hb;
short int kr;
void
o8 (void)
{
unsigned short int ov;
while (hb < 1)
{
if (hb != kr)
hb = 0;
for (ov = 0; ov < 16; ++ov)
{
kr = 0;
hb -= ((hb != 0) ? (ov < hb) : 1);
}
}
}
% timeout 15 x86_64-pc-linux-gnu-gcc-7.0.0-alpha20160522 -c -O3 -w gjpx2kcj.c
% echo $?
124
Strictly speaking, the testcase is not fully reduced. It is the minimal version
which still demonstrates the same hottest path in perf top as the original
program:
26.77% cc1 [.] (anonymous namespace)::pass_if_conversion::execute
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