https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68716
Bug ID: 68716
Summary: libgomp c.exp with -fipa-pta failures
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
When running libgomp c.exp with -fipa-pta, we run into the following failures:
...
FAIL: libgomp.c/linear-1.c execution test
FAIL: libgomp.c/omp-nested-1.c execution test
FAIL: libgomp.c/pr32362-1.c execution test
FAIL: libgomp.c/pr32362-2.c execution test
FAIL: libgomp.c/pr32362-3.c execution test
FAIL: libgomp.c/pr35549.c execution test
FAIL: libgomp.c/pr36802-2.c execution test
FAIL: libgomp.c/pr36802-3.c execution test
FAIL: libgomp.c/reduction-10.c execution test
FAIL: libgomp.c/reduction-11.c execution test
FAIL: libgomp.c/reduction-12.c execution test
FAIL: libgomp.c/reduction-7.c execution test
FAIL: libgomp.c/reduction-8.c execution test
FAIL: libgomp.c/reduction-9.c execution test
...
I've investigated the libgomp.c/omp-nested-1.c failure, and found that the
problem was missing clobbers on a function call after -fipa-pta.
Adding this bit (that was part of the original PR46032 patch:
https://gcc.gnu.org/ml/gcc-patches/2015-11/msg03448.html, but dropped here:
https://gcc.gnu.org/ml/gcc-patches/2015-11/msg03471.html) fixes the failures:
...
+ /* The caller clobbers what the callee does. */
+ lhs = get_function_part_constraint (fi, fi_clobbers);
+ rhs = get_function_part_constraint (cfi, fi_clobbers);
+ process_constraint (new_constraint (lhs, rhs));
...
