https://bugs.llvm.org/show_bug.cgi?id=45753
Bug ID: 45753
Summary: '# pragma clang loop vectorize (disable) 'doesn't work
when -fopenmp is added to compilation options
Product: OpenMP
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Clang Compiler Support
Assignee: unassignedclangb...@nondot.org
Reporter: fj876...@aa.jp.fujitsu.com
CC: llvm-bugs@lists.llvm.org
Some programs have both '# pragma clang loop vectorize (disable)' and '# pragma
omp parallel for' written.
Adding -fopenmp when compiling this program will run 'vectorized loop'.
I thought that 'vectorized loop' should not work with -fopenmp.
What do you think?
$ clang -O2 -Rpass=loop-vectorize a.c -S
openmp.c:9:3: remark: interleaved loop (interleaved count: 2)
[-Rpass=loop-vectorize]
for (i=0;i<n;++i) {
^
$ clang -O2 -Rpass=loop-vectorize a.c -S -fopenmp
openmp.c:7:1: remark: vectorized loop (vectorization width: 4, interleaved
count: 2) [-Rpass=loop-vectorize] #pragma omp parallel for ^
- a.c
void sub(float * restrict a,
float * restrict b,
float * restrict c,
int n) {
int i;
#pragma omp parallel for
#pragma clang loop vectorize(disable)
for (i=0;i<n;++i) {
c[i] = a[i] + b[i];
}
}
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