<html> <head> <meta content="text/html; charset=iso-8859-15" http-equiv="Content-Type"> </head> <body text="#000000" bgcolor="#FFFFFF"> <tt>After further investigation, it turns out that the problem is the > operator (and </tt><tt>isgreater() aswell</tt><tt>)</tt><tt>. In fact, prepending this to the kernel:</tt><tt> </tt> <blockquote><tt>#define isgreater(x, y) ((convert_int2(copysign((float2)1, y - x)) - 1) / 2)</tt><tt> </tt></blockquote> <tt>and replacing the > operator with the explicit relational function fixes the problem.</tt><tt> </tt><tt>I also forgot to me</tt><tt>ntion that I'm on Ivy Bridge hardware. </tt><tt> </tt> <div class="moz-cite-prefix"><tt>Il 29/09/2015 21:07, Lorenzo Pistone ha scritto:</tt><tt> </tt></div> <blockquote cite="mid:560AE186.3000107@gmail.com" type="cite"> <meta http-equiv="content-type" content="text/html; charset=iso-8859-15"> <tt> </tt><tt>Hello, the following kernel causes an assertion failed:</tt><tt> </tt> <blockquote><tt>__kernel void test(__global float2* ff){</tt><tt> </tt><tt> </tt><tt> float2 f1 = ff[0], f2 = ff[1];</tt><tt> </tt><tt> </tt><tt> float2 dist = f1 - f2;</tt><tt> </tt><tt> </tt><tt> dist += convert_float2(fabs(dist) > 0.5f) * </tt><tt>convert_float2(</tt><tt>copysign((coord)1, dist));</tt><tt> </tt><tt> </tt><tt> ff[3] = dist;</tt><tt> </tt> <tt>}</tt><tt> </tt> </blockquote> <tt>Result is:</tt><tt> </tt> <blockquote><tt>ASSERTION FAILED: Not supported</tt><tt> </tt><tt> </tt><tt> at file /home/pisto/sorgenti/beignet/backend/src/./ir/context.hpp, function gbe::ir::ImmediateIndex gbe::ir::Context::newIntegerImmediate(int64_t, gbe::ir::Type), line 95</tt><tt> </tt> </blockquote> </blockquote> <tt> </tt> </body> </html>