On Sat, 18 Jun 2005, Vincent Lefevre wrote:
On 2005-06-16 17:54:03 -0400, Robert Dewar wrote:
As you well know, not everyone agrees this is a bug, and this does
not have to do with performance. Saying over and over again that you
think it is a bug does not make it so.
I haven't seen any correct argument why it could not be a bug.
Saying that the x86 processor is buggy is just completely silly.
Only some gcc developers think so.
Don't know about you, but I consider any processor that is unable to store
a register to memory and then read back the same value to be buggy.
Sure, you can change rounding precision but according to my 2003 version
of "IA-32 Intel(r) Architecture Software Developer's Manual - Volume
1: Basic Architecture"
a) That takes at least 4 instructions.
b) Only affects some instructions, and then only the result.
c) Only affects the significand and not the exponent.
Disclaimer: I haven't done any testing to verify that this is actually the
case since I have no access to x86 hardware.
