https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68953
Bug ID: 68953
Summary: [6 Regression] [graphite] Wrong code w/ -O[12]
-floop-nest-optimize
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
gcc-6.0.0-alpha20151213 produces wrong code when compiling the following
snippet w/ -O1 (or -O2) -floop-nest-optimize:
int yu[][1] = { { 0 }, { 0 }, { 1 }, { 1 } };
int t4 = 0;
int
main(void)
{
int dx, zh, ro;
for (dx = 0; dx < 2; ++dx)
for (zh = 0; zh < 2; ++zh)
for (ro = 0; ro < 3; ++ro)
yu[ro][t4] = yu[zh+1][t4];
return yu[0][t4] != 0;
}
% gcc-6.0.0-alpha20151213 -o good -O2 amu8em8t.c
% ./good
% echo $?
0
% gcc-6.0.0-alpha20151213 -O2 -floop-nest-optimize -o bad amu8em8t.c
% ./bad
% echo $?
1
