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JIT test: remove SimdLoadBetweenBCs from ElidedBoundsChecks #129044

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Merged
AndyAyersMS merged 1 commit into from
Jun 5, 2026
Merged

JIT test: remove SimdLoadBetweenBCs from ElidedBoundsChecks #129044

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28 changes: 0 additions & 28 deletions src/tests/JIT/opt/RangeChecks/ElidedBoundsChecks.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -205,20 +205,6 @@ static int TwoArrays(int[] a, int[] b)
return a[0] + b[0] + a[3] + b[1];
}

[MethodImpl(MethodImplOptions.NoInlining)]
static float SimdLoadBetweenBCs(float[] a)
{
// The contiguous Vector128.Create from a[1..4] is lowered to a single
// SIMD load whose bounds check throws ArgumentOutOfRangeException, not
// IndexOutOfRangeException. It must act as a barrier: if a[0]'s check
// were strengthened to a[7] across it, a too-short array would observe
// IndexOutOfRangeException instead of the ArgumentOutOfRangeException
// the SIMD load is required to throw first.
float x = a[0];
Vector128<float> v = Vector128.Create(a[1], a[2], a[3], a[4]);
return x + v.ToScalar() + a[7];
}

[MethodImpl(MethodImplOptions.NoInlining)]
static int UnsignedShiftBySignBit(int i)
{
Expand Down Expand Up @@ -350,20 +336,6 @@ public static int TestEntryPoint()
if (UnsignedShiftBySignBit(-1) != 1 || UnsignedShiftBySignBit(0) != 0)
return 0;

// A SIMD load with a non-IOOB bounds check (ArgumentOutOfRangeException)
// between two array checks must act as a barrier: a[0]'s check must not
// be strengthened across it, otherwise a short array would observe
// IndexOutOfRangeException instead of ArgumentOutOfRangeException.
// The contiguous Vector128.Create -> single SIMD load recognition and the
// bounds-check coalescing being validated here are RyuJIT-specific, so
// only assert the exact exception type on CoreCLR.
if (!TestLibrary.Utilities.IsMonoRuntime && Vector128.IsHardwareAccelerated)
{
if (SimdLoadBetweenBCs(new float[8]) != 0f)
return 0;
Assert.Throws<ArgumentOutOfRangeException>(() => SimdLoadBetweenBCs(new float[1]));
}

return 100;
}
}
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