<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=""><br class=""><div><blockquote type="cite" class=""><div class="">On Sep 7, 2016, at 10:32 AM, Somenath Chakraborty via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div style="font-size:12.8px" class="">Hello,</div><div style="font-size:12.8px" class=""><br class=""></div><div style="font-size:12.8px" class="">I am facing an issue with a small test where there is a chance that sign-extension is not introduced as expected -</div><div style="font-size:12.8px" class=""><br class=""></div><div style="font-size:12.8px" class=""><div class="">#include <stdio.h></div><div class=""><br class=""></div><div class="">void func( long x )</div><div class="">{</div><div class=""> printf(" %ld \n", x);</div><div class="">}</div><div class=""><br class=""></div><div class="">int main()</div><div class="">{</div><div class=""> char c = -1;</div></div></div></div></blockquote><div><br class=""></div><div>I believe the signedness of char is implementation defined, have you tried using `signed char`?</div><div><br class=""></div><div>— </div><div>Mehdi</div><div><br class=""></div><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div style="font-size:12.8px" class=""><div class=""> func ( c ); // c is zero extended to x</div><div class=""> return 0;</div><div class="">}</div></div><div style="font-size:12.8px" class=""><br class=""></div><div style="font-size:12.8px" class="">generated IR - </div><div style="font-size:12.8px" class=""><br class=""></div><div style="font-size:12.8px" class=""><div class="">define i32 @main() #0 {<br class=""></div><div class=""> ........</div><div class=""> store i8 -1, i8* %c, align 1</div><div class=""> %2 = load i8, i8* %c, align 1</div><div class=""><b class=""><i class=""> <u class="">%3 = zext i8 %2 to i64</u></i></b></div><div class=""> call void @func(i64 %3)</div><div class="">}</div></div><div style="font-size:12.8px" class=""><br class=""></div><div style="font-size:12.8px" class="">The value to the formal argument is zero-extended, different from x86_64. Is this a known issue ? Am I missing anything ?</div><div style="font-size:12.8px" class=""><br class=""></div><div style="font-size:12.8px" class="">Thanks,</div><div style="font-size:12.8px" class="">Somenath</div><div style="font-size:12.8px" class=""><br class=""></div></div>
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