[Android][x86] System.Runtime.InteropServices.Tests.NFloatTests failed

[MaximLipnin]

There are the following failures in the System.Runtime.InteropServices.Tests.NFloatTests library test suite which are being hit on Android x86 leg in #65551:

<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: -4567, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.0140883" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -4570.1400001049042\nActual:   -4570.14013671875]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 244
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: -4567.89111, right: 3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.0003036" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -4571.0368032455444\nActual:   -4571.03662109375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 244
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: 0, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.0000064" result="Pass" />
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: 4567, right: -3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.0002445" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: 4570.1400001049042\nActual:   4570.14013671875]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 244
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: 4567.89111, right: -3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.000254" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: 4571.0368032455444\nActual:   4571.03662109375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 244
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: -4567, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.0005455" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -1454.4585501341485\nActual:   -1454.45849609375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Division(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 284
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: -4567.89111, right: 3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.000232" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -1452.1110360937337\nActual:   -1452.111083984375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Division(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 284
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: 0, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.0000054" result="Pass" />
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: 4567, right: -3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.0002909" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -1454.4585501341485\nActual:   -1454.45849609375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Division(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 284
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: 4567.89111, right: -3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.0002319" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -1452.1110360937337\nActual:   -1452.111083984375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Division(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 284
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: -4567, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0005737" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -4563.8599998950958\nActual:   -4563.85986328125]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 224
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: -4567.89111, right: 3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0002292" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -4564.7454233169556\nActual:   -4564.74560546875]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 224
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: 0, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0000053" result="Pass" />
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: 4567, right: -3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0029769" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: 4563.8599998950958\nActual:   4563.85986328125]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 224
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: 4567.89111, right: -3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0002373" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: 4564.7454233169556\nActual:   4564.74560546875]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 224
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: -4567, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0005585" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -14340.380479097366\nActual:   -14340.380859375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 264
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: -4567.89111, right: 3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0002354" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -14369.169233038556\nActual:   -14369.1689453125]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 264
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: 0, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0000054" result="Pass" />
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: 4567, right: -3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0020525" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -14340.380479097366\nActual:   -14340.380859375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 264
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: 4567.89111, right: -3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0002333" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -14369.169233038556\nActual:   -14369.1689453125]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 264
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>

https://dev.azure.com/dnceng/public/_build/results?buildId=1620509&view=ms.vss-test-web.build-test-results-tab&runId=45058618&paneView=debug&resultId=166936

cc @steveisok @akoeplinger @tannergooding @vargaz

Tagging subscribers to 'arch-android': @steveisok, @akoeplinger
See info in area-owners.md if you want to be subscribed.

Issue Details

---

There are the following failures in the System.Runtime.InteropServices.Tests.NFloatTests library test suite which are being hit on Android x86 leg in #65551:

<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: -4567, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.0140883" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -4570.1400001049042\nActual:   -4570.14013671875]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 244
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: -4567.89111, right: 3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.0003036" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -4571.0368032455444\nActual:   -4571.03662109375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 244
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: 0, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.0000064" result="Pass" />
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: 4567, right: -3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.0002445" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: 4570.1400001049042\nActual:   4570.14013671875]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 244
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(left: 4567.89111, right: -3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Subtraction" time="0.000254" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: 4571.0368032455444\nActual:   4571.03662109375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Subtraction(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 244
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: -4567, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.0005455" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -1454.4585501341485\nActual:   -1454.45849609375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Division(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 284
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: -4567.89111, right: 3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.000232" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -1452.1110360937337\nActual:   -1452.111083984375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Division(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 284
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: 0, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.0000054" result="Pass" />
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: 4567, right: -3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.0002909" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -1454.4585501341485\nActual:   -1454.45849609375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Division(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 284
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Division(left: 4567.89111, right: -3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Division" time="0.0002319" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -1452.1110360937337\nActual:   -1452.111083984375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Division(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 284
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: -4567, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0005737" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -4563.8599998950958\nActual:   -4563.85986328125]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 224
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: -4567.89111, right: 3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0002292" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -4564.7454233169556\nActual:   -4564.74560546875]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 224
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: 0, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0000053" result="Pass" />
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: 4567, right: -3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0029769" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: 4563.8599998950958\nActual:   4563.85986328125]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 224
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(left: 4567.89111, right: -3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Addition" time="0.0002373" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: 4564.7454233169556\nActual:   4564.74560546875]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Addition(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 224
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: -4567, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0005585" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -14340.380479097366\nActual:   -14340.380859375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 264
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: -4567.89111, right: 3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0002354" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -14369.169233038556\nActual:   -14369.1689453125]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 264
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: 0, right: 3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0000054" result="Pass" />
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: 4567, right: -3.1400001)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0020525" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -14340.380479097366\nActual:   -14340.380859375]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 264
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>
<test name="System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(left: 4567.89111, right: -3.14568996)" type="System.Runtime.InteropServices.Tests.NFloatTests" method="op_Multiply" time="0.0002333" result="Fail">
<failure exception-type="Xunit.Sdk.EqualException">
    <message><![CDATA[Assert.Equal() Failure\nExpected: -14369.169233038556\nActual:   -14369.1689453125]]></message>
    <stack-trace><![CDATA[   at System.Runtime.InteropServices.Tests.NFloatTests.op_Multiply(Single left, Single right) in /_/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.cs:line 264
at System.Reflection.RuntimeMethodInfo.InvokeWorker(Object obj, BindingFlags invokeAttr, Span`1 parameters)]]></stack-trace>
</failure>
</test>

https://dev.azure.com/dnceng/public/_build/results?buildId=1620509&view=ms.vss-test-web.build-test-results-tab&runId=45058618&paneView=debug&resultId=166936

cc @steveisok @akoeplinger @tannergooding @vargaz

Author:	MaximLipnin
Assignees:	-
Labels:	arch-x86, os-android
Milestone:	-

[vargaz]

Float tests should not compare using exact equality, they should use the
Assert.Equal(expected,actual,precision) variant.

[tannergooding]

@vargaz, no.

IEEE 754 floating-point is deterministic and there are plenty of cases where using exact equality is warranted and correct.

In this case, these are all testing single simple operations and that nfloat op nfloat produces the bitwise identical result to double op double on 64-bit and float op float on 32-bit.

These represent concrete and real bugs in mono and need to be fixed.

[tannergooding]

That is, these represent issues where the code executing for the given architecture is not IEEE 754 compliant and is likely due to the JIT/AOT performing invalid optimizations or other changes to the code.

[vargaz]

mono on x86 is still using the old fp stack based fp instructions which operate with a different precision, that might be the cause of these problems.

[tannergooding]

In particular, the test is doing:

[Theory]
[InlineData(-4567.0f, 3.14f)]
[InlineData(-4567.89101f, 3.14569f)]
[InlineData(0.0f, 3.14f)]
[InlineData(4567.0f, -3.14f)]
[InlineData(4567.89101f, -3.14569f)]
public static void op_Subtraction(float left, float right)
{
    NFloat result = new NFloat(left) - new NFloat(right);

    if (Environment.Is64BitProcess)
    {
        Assert.Equal((double)left - right, result.Value);
    }
    else
    {
        Assert.Equal(left - right, result.Value);
    }
}

where

[NonVersionable]
public static NFloat operator -(NFloat left, NFloat right) => new NFloat(left._value - right._value);

and where:

#if TARGET_32BIT
using NativeType = System.Single;
#else
using NativeType = System.Double;
#endif

// ...

private readonly NativeType _value;

---

The inputs in question here are -4567 (which is exactly representable) and 3.14 (whose exact represented value is 3.1400001049041748046875). The exact computed result here is -4570.1400001049041748046875 which then must be rounded to the nearest representable float: -4570.14013671875

Assert.Equal is the double overload and so it looks like Mono is treating the left - right as (double)left - (double)right, rather than as (double)(left - right) .

We could "fix" this in the tests by inserting an explicit cast to float; e.g. (float)(left - right). But this also represents a determinism bug in Mono as compared to what RyuJIT does, with what most hardware/other languages do, and with regards to what the user likely intended. It also represents a case where Mono is not IEEE 754 compliant, which while "allowed" by the original ECMA-335 spec (due to only having the F stack type) is likely very undesirable and ultimately makes the code less readable, more error prone, and was designed around the x87 FPU unit existing at the time (which doesn't match what hardware from ~2004 onwards as used as the standard and what other architectures like Arm32, Arm64, etc follow).

[vargaz]

Will try to transition the x86 backend to SSE, will take some time. In the meantime, these tests should be disabled on mono+x86.

[MaximLipnin]

In the meantime, these tests should be disabled on mono+x86.

Yeah, they are going to be disabled in #65551