https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105001
Bug ID: 105001
Summary: If executing with non-nvptx offloading, but nvptx
offloading compilation is enabled: FAIL:
libgomp.c/pr104783.c execution test
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: openmp
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: tschwinge at gcc dot gnu.org
CC: ams at gcc dot gnu.org, jakub at gcc dot gnu.org, jules at
gcc dot gnu.org,
vries at gcc dot gnu.org
Target Milestone: ---
If executing with non-nvptx offloading (tested: GCN, Intel MIC (emulated)), but
nvptx offloading compilation is enabled, the PR104783 test case
'libgomp.c/pr104783.c' FAILs its execution test, SIGSEGV-like.
GCN:
Memory access fault by GPU node-1 (Agent handle: 0x1a93b40) on address
(nil). Reason: Page not present or supervisor privilege.
Intel MIC (emulated):
offload error: process on the device 0 unexpectedly exited with code 0
The problem goes away if compiling without nvptx offloading:
'-foffload=amdgcn-amdhsa', for example.
So, I suppose a problem with the middle end SIMT transformations?
Compiling manually, also I see:
source-gcc/libgomp/testsuite/libgomp.c/pr104783.c: In function
‘main._omp_fn.0’:
source-gcc/libgomp/testsuite/libgomp.c/pr104783.c:10:9: warning:
‘<anonymous>’ is used uninitialized [-Wuninitialized]
10 | #pragma omp atomic update
| ^~~
source-gcc/libgomp/testsuite/libgomp.c/pr104783.c:10:9: note: ‘<anonymous>’
was declared here
10 | #pragma omp atomic update
| ^~~
