ppc64le - Fix deviation in floating point values caused by FMA

[prashantkhoje]

This was exposed while testing CockroachDB. Following tests from pkg/sql/opt/exec/execbuilder fail due to floating point precision differences caused by FMA:

• TestExecBuild/local/geospatial
• TestExecBuild/local-vec-off/geospatial
• TestExecBuild/local-spec-planning/geospatial
• TestExecBuild/fakedist/geospatial
• TestExecBuild/fakedist-vec-off/geospatial
• TestExecBuild/fakedist-metadata/geospatial
• TestExecBuild/fakedist-disk/geospatial
• TestExecBuild/fakedist-spec-planning/geospatial

With explicit casts in this patch, these failures are resolved.

References: https://go.dev/ref/spec#Floating_point_operators https://github.com/golang/go/issues/53297 https://github.com/golang/go/issues/48145 https://github.com/disintegration/gift/issues/20#issuecomment-524551797

[prashantkhoje]

@rsned, please review.

[prashantkhoje]

logictest, logictestccl, execbuilder tests fail for geospatial test-data on ppc64le

[prashantkhoje]

@otan, fyi

[prashantkhoje]

@ambujkumar3 fyi

[rsned]

Can you see if this still occurs with the latest updates.

[prashantkhoje]

Yes. Cockroachdb still encounters FMA failures with the latest golang/geo. The changes proposed here fixes the deviation.