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/petsc/src/ksp/ksp/impls/bcgsl/
H A Dbcgsl.c16 PetscReal kappa0, kappaA, kappa1; in KSPSolve_BCGSL() local
237 kappa1 = PetscRealPart(BLASdot_(&ldMZ, AYlc, &ione, AYtc, &ione)); in KSPSolve_BCGSL()
239 if (kappa1 < 0) kappa1 = -kappa1; in KSPSolve_BCGSL()
240 kappa1 = PetscSqrtReal(kappa1); in KSPSolve_BCGSL()
242 if (kappa0 != 0.0 && kappa1 != 0.0) { in KSPSolve_BCGSL()
243 if (kappaA < 0.7 * kappa0 * kappa1) { in KSPSolve_BCGSL()
244 ghat = (kappaA < 0.0) ? -0.7 * kappa0 / kappa1 : 0.7 * kappa0 / kappa1; in KSPSolve_BCGSL()
246 ghat = kappaA / (kappa1 * kappa1); in KSPSolve_BCGSL()