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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello, <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>LLVM/Clang supports Vector Extensions. But it doesn't give the definition for <o:p></o:p></p><p class=MsoNormal>vector type which size is smaller than 64bit. Without this definition, LLVM/Clang <o:p></o:p></p><p class=MsoNormal>will generate wrong assemblycode for ARM due to incorrect alignment information <o:p></o:p></p><p class=MsoNormal>and cause executable program bus err. The attached file t.c is the test case to show <o:p></o:p></p><p class=MsoNormal>the bus err. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>"clang -ccc-host-triple armv7-none-linux-gnueabi -mfloat-abi=softfp -mfpu=neon<o:p></o:p></p><p class=MsoNormal>-O3 t.c" is the command line. With the optimization, load a short3 will be<o:p></o:p></p><p class=MsoNormal>promoted to alignment 8 and use ldr.64 to load. ldr.64 is required to have<o:p></o:p></p><p class=MsoNormal>memory address alignment 4 at least. However, for short3 type, the natural<o:p></o:p></p><p class=MsoNormal>aligement is alignment 6, with the second element in array, it cannot hold<o:p></o:p></p><p class=MsoNormal>alignment 4, So the instruction gets bus err.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have reported this into the bugzilla. The URL is <o:p></o:p></p><p class=MsoNormal><a href="http://llvm.org/bugs/show_bug.cgi?id=11719">http://llvm.org/bugs/show_bug.cgi?id=11719</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>At the meantime, I also provide the fix for this problem adding those missing definitions. <o:p></o:p></p><p class=MsoNormal>And I have run the tests from LLVM/Clang in cross mode and simple cross mode. My fix<o:p></o:p></p><p class=MsoNormal>doesn't change any result from validtion tests. I believe this is good fix. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Clang.diff is the change for clang portion, LLVM.diff is the change for LLVM protion.<o:p></o:p></p><p class=MsoNormal>Test.result and report.txt are failure reports from running llvm/test and projects/test-suite on ARM.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Please review it. Thank you.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> Yin Ma<o:p></o:p></p></div></body></html>