<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">llvmgcc4 emits LLVM byte code before executing GCC optimizations, so one can say that llvmgcc4 disables all GCC optimizations.<DIV><BR><DIV><DIV>On Jul 31, 2006, at 11:01 AM, Zhiru Zhang wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV>Hi,</DIV> <DIV>I am trying to turn on the new GCC auto-vectorization feature within llvmgcc4. Below is the command I used, but nothing was vectorized. Does it mean that llvmgcc4 has disabled this optimization and all I can do is to embed SSE intrinsics in the source code by hand? </DIV> <DIV> </DIV> <DIV>Thanks!</DIV> <DIV> </DIV> <DIV>./llvm-gcc4-x86/bin/llvm-gcc -c -O2 -ftree-vectorize -msse -ftree-vectorizer-verbose=5 -emit-llvm vec.c -o vec.bc</DIV> <DIV> </DIV> <DIV>////////////////////vec.c/////////////////////////</DIV> <DIV>int a[256], b[256], c[256];<BR>foo () {<BR> int i;<BR> for (i=0; i<256; i++){<BR> a[i] = b[i] + c[i];<BR> }<BR>}<BR> </DIV> <DIV> </DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">LLVM Developers mailing list</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><A href="mailto:LLVMdev@cs.uiuc.edu">LLVMdev@cs.uiuc.edu</A> <SPAN class="Apple-converted-space"> </SPAN><A href="http://llvm.cs.uiuc.edu">http://llvm.cs.uiuc.edu</A></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><A href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev</A></DIV> </BLOCKQUOTE></DIV><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Verdana; font-size: 11px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV>-</DIV><DIV>Devang</DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR class="Apple-interchange-newline"></SPAN> </DIV><BR></DIV></BODY></HTML>