Date: Tue, 21 Jan 2020 08:11:50 +1100 (AEDT) From: Damian McGuckin <damianm@....com.au> To: musl@...ts.openwall.com Subject: Triggering Overflow (or Underflow) without triggering Inexact on i386 I am trying to write arithmetic expressions using only x87 instructions to trigger an exception. The ASM instruction to raise the flag in the status register has way too much overhead. My normal technique of doing either of these would also trigger Inexact. e.g. volatile long double t; Overflow: t = largest normal long double, t *= t; Underflow: t = smallest normal long double, t *= t; Can it be triggered WITHOUT also triggering INEXACT? Regards - Damian Pacific Engineering Systems International, 277-279 Broadway, Glebe NSW 2037 Ph:+61-2-8571-0847 .. Fx:+61-2-9692-9623 | unsolicited email not wanted here Views & opinions here are mine and not those of any past or present employer
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