[Bug target/94542] New: test gcc/testsuite/gcc.dg/tls/pr24428-2.c generates incorrect code on ppc64le with -mpcrel -mcpu=future -O2
acsawdey at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu Apr 9 17:09:25 GMT 2020
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94542
Bug ID: 94542
Summary: test gcc/testsuite/gcc.dg/tls/pr24428-2.c generates
incorrect code on ppc64le with -mpcrel -mcpu=future
-O2
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: acsawdey at gcc dot gnu.org
Target Milestone: ---
The test case is:
__thread double thrtest[81];
int main ()
{
double *p, *e;
e = &thrtest[81];
for (p = &thrtest[0]; p < e; ++p)
*p = 1.0;
return 0;
}
Generated code for p and e is
paddi 9,13,thrtest@tprel
pla 8,thrtest+648@pcrel
The second should also be using a @tprel relocation. Because it didn't, the
loop runs off the end of allocated memory and segfaults. This test runs
correctly when compiled with -O0.
Compile command:
/home2/sawdey/work/gcc/mamboCI/build-mambo/gcc/xgcc
-B/home2/sawdey/work/gcc/mamboCI/build-mambo/gcc/
/home2/sawdey/work/gcc/mamboCI/pike-trunk/gcc/testsuite/gcc.dg/tls/pr24428-2.c
-O2 -mpcrel -mcpu=future -S -o pr24428-2.exe.s
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