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Merge pull request #2272 from seberg/thread-sqrt-of-negative 

Avoid taking root of negative number in symv_thread.c
This commit is contained in:
Martin Kroeker 2019-09-30 11:27:29 +02:00 committed by GitHub
parent 5e244d80f2 6355c25dde
commit c07d78b9e9
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 7 additions and 3 deletions
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10
driver/level2/symv_thread.c
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@ -166,7 +166,11 @@ int CNAME(BLASLONG m, FLOAT *alpha, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG i
if (nthreads - num_cpu > 1) {
double di = (double)i;
width = ((BLASLONG)(sqrt(di * di + dnum) - di) + mask) & ~mask;
if (di * di - dnum > 0) {
width = ((BLASLONG)(-sqrt(di * di - dnum) + di) + mask) & ~mask;
} else {
width = m - i;
}
if (width < 4) width = 4;
if (width > m - i) width = m - i;
@ -212,9 +216,9 @@ int CNAME(BLASLONG m, FLOAT *alpha, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG i
double di = (double)(m - i);
if (di * di - dnum > 0) {
width = ((BLASLONG)(-sqrt(di * di - dnum) + di) + mask) & ~mask;
width = ((BLASLONG)(-sqrt(di * di - dnum) + di) + mask) & ~mask;
} else {
width = m - i;
width = m - i;
}
if (width < 4) width = 4;