tree cac6268ef5030208ef8be48f178c3629a536d4c5
parent bc0b7d42bbd04b4af0a86eb56556ad8fcc6985a2
author bjacob <benoitjacob@google.com> 1702593882 -0500
committer GitHub <noreply@github.com> 1702593882 -0800
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Tweaks to e2e matmul tests (#15930)

This restricts the range of random `bf16` test matrix elements, so that
we avoid larger-accumulation-size matmul tests getting accumulators >=
256, at which point integers are no longer exactly representable in
`bf16` and accumulation becomes very inaccurate. This is what was
causing test failures on large tests specifically in
https://github.com/openxla/iree/pull/15911 .

This also fixes the computation of the window of the test matrices that
is displayed on error. The problem arose when diagnosing a matmul test
error in cases where M and N are both small, and K is larger. The new
window computation is also just simpler.