<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">What is the motivation for using intrinsics versus adding new instructions?<div class=""><br class=""></div><div class="">—Owen</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Oct 24, 2014, at 4:24 AM, Demikhovsky, Elena <<a href="mailto:elena.demikhovsky@intel.com" class="">elena.demikhovsky@intel.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><font face="Calibri" size="2" style="font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-size: 11pt;" class=""><div class=""><font color="#1F497D" class="">Hi,</font></div><div class=""><font color="#1F497D" class=""> </font></div><div class=""><font color="#1F497D" class="">We would like to add support for masked vector loads and stores by introducing new target-independent intrinsics. The loop vectorizer will then be enhanced to optimize loops containing conditional memory accesses by generating these intrinsics for existing targets such as AVX2 and AVX-512. The vectorizer will first ask the target about availability of masked vector loads and stores. The SLP vectorizer can potentially be enhanced to use these intrinsics as well.</font></div><div class=""><font color="#1F497D" class=""> </font></div><div class=""><font color="#1F497D" class="">The intrinsics would be legal for all targets; targets that do not support masked vector loads or stores will scalarize them.</font></div><div class=""><font color="#1F497D" class="">The addressed memory will not be touched for masked-off lanes. In particular, if all lanes are masked off no address will be accessed.</font></div><div class=""><font color="#1F497D" class=""> </font></div><div class=""><font color="#1F497D" class=""> call void @llvm.masked.store (i32* %addr, <16 x i32> %data, i32 4, <16 x i1> %mask)</font></div><div class=""><font color="#1F497D" class=""> </font></div><div class=""><font color="#1F497D" class=""> %data = call <8 x i32> @llvm.masked.load (i32* %addr, <8 x i32> %passthru, i32 4, <8 x i1> %mask)</font></div><div class=""><font color="#1F497D" class=""> </font></div><div class=""><font color="#1F497D" class="">where %passthru is used to fill the elements of %data that are masked-off (if any; can be zeroinitializer or undef).</font></div><div class=""><font color="#1F497D" class=""> </font></div><div class=""><font color="#1F497D" class="">Comments so far, before we dive into more details?</font></div><div class=""><font color="#1F497D" class=""> </font></div><div class=""><font color="#1F497D" class="">Thank you.</font></div><div class=""><font color="#1F497D" class=""> </font></div><div class=""><font color="#1F497D" class="">- Elena and Ayal</font></div><div class=""><font color="#1F497D" class=""> </font></div><div class=""> </div></span></font><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""></span><p style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">---------------------------------------------------------------------<br class="">Intel Israel (74) Limited</p><p style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">This e-mail and any attachments may contain confidential material for<br class="">the sole use of the intended recipient(s). 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