On Wed, Oct 26, 2011 at 10:12 PM, Justin Holewinski < [email protected]> wrote:
> On Wed, Oct 26, 2011 at 7:37 PM, Rodrigo Kumpera <[email protected]>wrote: > >> >> >> On Wed, Oct 26, 2011 at 9:06 PM, Justin Holewinski < >> [email protected]> wrote: >> >>> On Wed, Oct 26, 2011 at 6:15 PM, Rodrigo Kumpera <[email protected]>wrote: >>> >>>> The CLR demands that all floating point calculations to be conducted >>>> with double precision. >>> >>> >>> Where in the spec does it state this? Everything I've read allows for >>> both 32-bit and 64-bit representations, with the only restriction being that >>> arithmetic must be performed with enough precision for the expression type. >>> >>> And if 64-bit arithmetic is required, why is 32-bit used in the 32-bit >>> Mono VM, and in the .NET VM? >>> >>> >> >> 32bits mono uses 64bits precision for both float and double types. >> > >> AFAICT, .net uses 64bits precision on all cases. >> > > I'm getting code like the following on .NET 4.0 x64: > > 00000099 mov rcx,qword ptr [rsp+000000D8h] > 000000a1 mov rax,qword ptr [rsp+30h] > 000000a6 movss xmm0,dword ptr [rsp+28h] > 000000ac mulss xmm0,dword ptr [rcx+rax*4+10h] > 000000b2 movss dword ptr [rsp+38h],xmm0 > > Is there any way to force Mono to use 32-bit arithmetic for floats? > No, not really. Please file a bug over this as we probably should change it.
_______________________________________________ Mono-list maillist - [email protected] http://lists.ximian.com/mailman/listinfo/mono-list
