<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>On Jul 10, 2013, at 11:39 AM, Eli Bendersky <<a href="mailto:eliben@google.com">eliben@google.com</a>> wrote:</div><blockquote type="cite"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Wed, Jul 10, 2013 at 11:26 AM, John McCall <span dir="ltr"><<a href="mailto:rjmccall@apple.com" target="_blank">rjmccall@apple.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex; position: static; z-index: auto; "><div style="word-wrap:break-word"><div><div class="h5"><div>On Jul 10, 2013, at 11:18 AM, Eli Bendersky <<a href="mailto:eliben@google.com" target="_blank">eliben@google.com</a>> wrote:</div>
<blockquote type="cite"><div dir="ltr">On Wed, Jul 10, 2013 at 3:03 AM, John McCall <span dir="ltr"><<a href="mailto:rjmccall@apple.com" target="_blank">rjmccall@apple.com</a>></span> wrote:<br><div class="gmail_extra">
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<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>On Jun 27, 2013, at 3:57 PM, Eli Bendersky <<a href="mailto:eliben@google.com" target="_blank">eliben@google.com</a>> wrote:<br>
</div><div>> Without fmath-errno, Clang currently generates calls to @llvm.pow.* intrinsics when it sees pow*(). This may not be suitable for all targets (for example PNaCl), so the attached patch adds a target hook that CodeGen queries. The target can state its preference for having or not having the intrinsic generated. Non-PNaCl behavior remains unchanged; PNaCl-specific test added.<br>
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</div>Isn't a more straightforward and less invasive approach to just invoke the compiler with -fno-builtin=pow or something along those lines?<br></blockquote><div><br></div><div>We don't control the flags users supply to Clang though. </div>
</div></div></div></blockquote><div><br></div></div></div>Then handle it in the driver.</div></blockquote><div><br></div><div>Would that not be more intrusive, then? Or perhaps I'm misunderstanding what you're proposing.</div>
</div></div></div></blockquote><br></div><div>It would be isolated to target-specific logic in target-specific parts of the toolchain instead of inventing a new option that's basically "do what PNaCl wants" and then propagating it through the entire compiler.</div><div><br></div><div>John.</div><br></body></html>