<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The ability to use vector initializer lists is a GNU vector extension and is unrelated to the NEON intrinsics in arm_neon.h. On little endian machines it works fine, however on big endian machines it exhibits surprising behaviour:<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> uint32x2_t x = {42, 64};<o:p></o:p></p><p class=MsoNormal> return vget_lane_u32(x, 0); // Will return 64.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Because of this, explicitly call out that it is unsupported on big endian machines.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>This patch will emit the following warning in big-endian mode:<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> test.c:3:15: warning: Vector initializers are part of the GNU vector extensions and are not compatible with NEON intrinsics on big endian ARM targets [-Wgnu]<o:p></o:p></p><p class=MsoNormal> int32x4_t x = {0, 1, 2, 3};<o:p></o:p></p><p class=MsoNormal> ^<o:p></o:p></p><p class=MsoNormal> test.c:3:15: note: Consider using vld1q_s32() to initialize a vector from memory, or vcombine_s32(vcreate_s32(), vcreate_s32()) to initialize from integer constants<o:p></o:p></p><p class=MsoNormal> 1 warning generated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It’s fairly simple, is it OK to commit?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cheers,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>James<o:p></o:p></p></div></body></html>