afee8aa1c1
This PR fixes a SIGFPE crash on x86_64 when evaluating `(ISize.minValue / -1 : ISize)`, filling an omission from #11624. Closes #12097.
40 lines
1.4 KiB
Text
40 lines
1.4 KiB
Text
/-!
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# Signed integer division overflow test
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On x86_64, INT_MIN / -1 and INT_MIN % -1 cause a SIGFPE (floating point exception)
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because the result overflows the destination register. This test verifies the fix.
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The expected behavior (per BitVec.sdiv semantics): return minValue (wrapped result) for div,
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and 0 for mod.
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-/
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-- Test that signed division handles overflow correctly
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-- INT_MIN / -1 should return INT_MIN (wrapped)
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#guard (Int8.minValue / -1 : Int8) == Int8.minValue
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#guard (Int16.minValue / -1 : Int16) == Int16.minValue
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#guard (Int32.minValue / -1 : Int32) == Int32.minValue
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#guard (Int64.minValue / -1 : Int64) == Int64.minValue
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#guard (ISize.minValue / -1 : ISize) == ISize.minValue
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-- Test that signed mod handles overflow correctly
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-- INT_MIN % -1 should return 0
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#guard (Int8.minValue % -1 : Int8) == 0
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#guard (Int16.minValue % -1 : Int16) == 0
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#guard (Int32.minValue % -1 : Int32) == 0
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#guard (Int64.minValue % -1 : Int64) == 0
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#guard (ISize.minValue % -1 : ISize) == 0
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-- Also test via #eval to exercise the C runtime
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#eval (Int8.minValue / -1 : Int8)
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#eval (Int16.minValue / -1 : Int16)
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#eval (Int32.minValue / -1 : Int32)
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#eval (Int64.minValue / -1 : Int64)
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#eval (ISize.minValue / -1 : ISize)
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#eval (Int8.minValue % -1 : Int8)
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#eval (Int16.minValue % -1 : Int16)
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#eval (Int32.minValue % -1 : Int32)
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#eval (Int64.minValue % -1 : Int64)
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#eval (ISize.minValue % -1 : ISize)
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