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On 10/19/2017 5:48 PM, Joseph Myers wrote:
On Thu, 19 Oct 2017, Patrick McGehearty wrote:Guaranteeing "inexact" is not part of the goals for most libm functions, so I expect you can remove that term.The "inexact" test was required to pass the (make check) math lib tests.You'll need to explain more. For functions which are not fully defined by a binding to IEEE operations, both spurious and missing "inexact" should be allowed by the testsuite.
When the following lines are commented out: double force_underflow = tiny * tiny; math_force_eval (force_underflow); The following failures appear (plus repeated for other rounding modes) Failure: exp (-0x2.c4edp+12): Exception "Underflow" not set Failure: exp (-0x2.c5b2319c4843ap+12): Exception "Underflow" not set Failure: exp (-0x2.c5b2319c4843cp+12): Exception "Underflow" not set Failure: exp (-0x2.c5b234p+12): Exception "Underflow" not set Failure: exp (-0x2.c5b23p+12): Exception "Underflow" not set Failure: exp (-0x2.c5bd48bdc7c0cp+12): Exception "Underflow" not set Failure: exp (-0x2.c5bd48bdc7c0ep+12): Exception "Underflow" not set Failure: exp (-0x2.c5bd48p+12): Exception "Underflow" not set Failure: exp (-0x2.c5bd4cp+12): Exception "Underflow" not set Failure: exp (-0x2.ebe224p+8): Exception "Underflow" not set Failure: exp (-0x2.ebe227861639p+8): Exception "Underflow" not set Failure: exp (-0x2.ebe228p+8): Exception "Underflow" not set Failure: exp (-0x4.d2p+8): Exception "Underflow" not set Failure: exp (-0xf.ffffffffffff8p+1020): Exception "Underflow" not set Failure: exp (-0xf.fffffp+124): Exception "Underflow" not set The same pair of instructions are used in the old e_exp.c to set the underflow exception, which means the new code will match the behavior of the old code for underflows. - patrick
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