RFR: 8373722: [TESTBUG] compiler/vectorapi/TestVectorOperationsWithPartialSize.java fails intermittently

[Jie Fu]

On Wed, 24 Dec 2025 01:54:02 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

> We used the `Math.ulp(sum) * 10` to calculate the tolerance, which means the difference of expected and actual value is inside of 10 ULP around the value of `sum`.

The question here is what do you mean by `expected value`?
Do you mean the sequential scalar floating point add with rounding errors will produce the expected value?
Or do you mean the golden value in math?

Just consider the following case

1000.0f + Float.MAX_VALUE - Float.MAX_VALUE


The sequential scalar floating add will result 0.0f.
However, the golden value in math should be 1000.0f.

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PR Comment: https://git.openjdk.org/jdk/pull/28960#issuecomment-3688511017