On Monday, 30 June 2014 at 22:58:48 UTC, Walter Bright wrote:
Wow. Fortunately, there's a switch http://publib.boulder.ibm.com/infocenter/cellcomp/v101v121/index.jsp?topic=/com.ibm.xlcpp101.cell.doc/proguide/spu_sp_diffs.html so it'll work correctly.
That's the same link I provided, but I presume the compiler switch kills performance? You have the same with ARM processors. NEON (SIMD) instructions are not IEEE754 compliant. VPF is almost compliant, but does not support subnormal numbers and flush them to zero. Which can be a disaster…
So basically, floating point is not portable unless you give up performance or check all expressions with worst case analysis based on deficiencies on all current platforms.
