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Jakub Jelinek wrote: > Hi! > > feholdexcept is supposed to clear the sticky exception bits: > "The feholdexcept function saves the current floating-point environment in the object > pointed to by envp, clears the floating-point status flags, and then installs a non-stop > (continue on floating-point exceptions) mode, if available, for all floating-point > exceptions." > and > "A floating-point status flag is a system variable whose value is set > (but never cleared) when a floating-point exception is raised, which occurs as a side effect > of exceptional floating-point arithmetic to provide auxiliary information." > > Several feholdexcept implementations didn't handle this right. > Also, e.g. feupdateenv was a stub on x86_64 eventhough it is IMHO easily > implementable and other arches had bugs in it too (e.g. ia64 would rise > wrong exceptions and always return a failure). > I added a new testcase for feholdexcept/feupdateenv (hopefully I haven't > misinterpreted the standard) and I believe other arches (ppc*, s390*, ...) > will need some care too. > powerpc32 and powerpc64 both show two failures with the new test-fenv: Test: feholdexcept_tests FE_DIVBYZERO|FE_INVALID test Fail: Exception "DIVBYZERO" is not set Pass: Exception "INVALID" is set Pass: Exception "INEXACT" is not set Pass: Exception "UNDERFLOW" is not set Pass: Exception "OVERFLOW" is not set and Test: feholdexcept_tests FE_INEXACT|FE_INVALID test Pass: Exception "DIVBYZERO" is not set Fail: Exception "INVALID" is not set Pass: Exception "INEXACT" is set Pass: Exception "UNDERFLOW" is not set Pass: Exception "OVERFLOW" is not set We will look into this.
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