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Are you able to send any IR for others to reproduce this issue? On Wed, Jul 17, 2013 at 11:23 PM, Peter Newman <peter at uformia.com> wrote: > Unfortunately, this doesn't appear to be the bug I'm hitting. I applied > the fix to my source and it didn't make a difference. > > Also further testing found me getting the same behavior with other SIMD > instructions.

Unfortunately, this doesn't appear to be the bug I'm hitting. I applied the fix to my source and it didn't make a difference. Also further testing found me getting the same behavior with other SIMD instructions. The common factor is in each case, ECX is set to 0x7fffffff, and it's an operation using xmm ptr ecx+offset . Additionally, turning the optimization level passed to

...t;2 x double> %19, double %18, i32 1 %21 = insertvalue { <2 x double>, <2 x double>, <2 x double> } %15, <2 x double> %20, 2 store <4 x double> zeroinitializer, <4 x double>* %1 store <2 x double> zeroinitializer, <2 x double>* %0 br label %array_loop array_loop: ; preds = %array_loop_tail, %body %22 = load <4 x double>* %1 %23 = extractvalue { <2 x double>, <2 x double>, <2 x double> } %21, 0 %24 = extractvalue { <2 x double>, <2 x double>, <2 x double> } %21...