>>>>> "Dave" == Dave Korn <[EMAIL PROTECTED]> writes:
Dave> ----Original Message---- >> From: Paul Koning Sent: 15 April 2005 17:56 >>>>>>> "Dave" == Dave Korn <[EMAIL PROTECTED]> writes: >> Dave> Doesn't the C language spec require the mode to be switchable Dave> at runtime? >> Dave> In any case, the ARM or Alpha isn't prevented from working in Dave> such a fashion just because the rounding mode is encoded in the Dave> instruction; it just means that fp primitives have to be Dave> compiled as intrinsics that test whatever flag controls the Dave> rounding mode and then branch to an fp insn of the appropriate Dave> form. >> That only works if the notion of switchable rounding mode exists. Dave> I'm not sure. Either you don't get me, or I don't get you, but Dave> what I thought I was describing was a way of working around the Dave> lack of a switchable mode by compiling the code both ways with Dave> a runtime test of a flag. Sorry, poor wording. What I meant is that those architectures do floating point in exactly one way. You have NO way to say what kind of rounding you want, not by a settable state, not by a different opcode -- not at all. paul
