Update scaling routines to return immediately when scaling with one #674
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* SCAL: Quick return if scaling factor is one * LASCL: If cto == cfrom and neither input is NaN or Inf, skip scaling
langou
reviewed
May 21, 2022
| IF (INCX.EQ.1) THEN | ||
| * | ||
| * code for increment equal to 1 | ||
| * | ||
| DO I = 1,N | ||
| ZX(I) = DCMPLX(DA,0.0d0)*ZX(I) | ||
| ZX(I) = DCMPLX(DA*DBLE(ZX(I)),DA*DIMAG(ZX(I))) |
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Nice. Thanks. Much better like this indeed. The previous line of code was weird.
langou
approved these changes
May 21, 2022
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Description
This is a proposal to add a check for alpha being equal to one to the early return criterion of the scaling routines.
It appears prudent to add an early exit to the BLAS and the LAPACK scaling routines and not rely on the caller to precede every invocation of a scaling routine with a check for one. Other BLAS routines such as HER or AXPY have a quick return based on the value of alpha already.