http://llvm.org/bugs/show_bug.cgi?id=15758
Bug ID: 15758
Summary: Incorrect vectorization of a long double array by
packed vectors
Product: clang
Version: 3.2
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
With loop-vectorizer is enabled by -mllvm -vectorize-loops, clang automatically
vectorizes the assignment on a long-double array (16 bytes aligned) by
assignment on 16-bytes-aligned-x86_fp80-packed vectors. Because of the
alignment mismatch between array's elements and packed elements, subsequent
access on the array produces incorrect result.
Below is the test case.
int main (void) {
long double x[1027];
for (int i = 0; i < 1027; i++) {
x[i] = (long double) i;
}
for (int i = 0; i < 1027; i++) {
assert (x[i] == (long double) i);
}
return 0;
}
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