[PATCH] D21127: Remove redundant FMUL in Newton-Raphson SQRT code
Nikolai Bozhenov via llvm-commits
llvm-commits at lists.llvm.org
Thu Jun 9 06:50:33 PDT 2016
n.bozhenov added a comment.
Here are the results with vfmadd132ss:
est1 est2
Total tests: 2130706432 2130706432
Inexact results: 911966111 817657369
Estimate missed by 1 ULP: 854798052 785288244
Estimate missed by 2 ULP: 56073347 32117919
Estimate missed by 3 ULP: 1092044 251206
Estimate missed by 4 ULP: 2668 0
Estimate missed by >4 ULP: 0 0
Generally, using FMA improves precision. Again, the new code
sequence produces statistically better results.
http://reviews.llvm.org/D21127
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