http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59697
--- Comment #1 from Øystein Schønning-Johansen <oystein at gnubg dot org> --- Follow up: I try the same code on a RedHat 6.5 64bit workstation with GCC4.4. st-lx794988(ojohans) -/ojohans 37> gcc -v Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) On this system the sse function is also translated to avx instructions. :-( 00000000004004f0 <calculate_sse>: 4004f0: c1 fe 02 sar $0x2,%esi 4004f3: 85 f6 test %esi,%esi 4004f5: 74 2e je 400525 <calculate_sse+0x35> 4004f7: 83 ee 01 sub $0x1,%esi 4004fa: c5 f8 c6 c0 00 vshufps $0x0,%xmm0,%xmm0,%xmm0 4004ff: 48 c1 e6 04 shl $0x4,%rsi 400503: 48 8d 44 37 10 lea 0x10(%rdi,%rsi,1),%rax 400508: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 40050f: 00 400510: c5 f8 28 0f vmovaps (%rdi),%xmm1 400514: c5 f0 59 c8 vmulps %xmm0,%xmm1,%xmm1 400518: c5 f8 29 0f vmovaps %xmm1,(%rdi) 40051c: 48 83 c7 10 add $0x10,%rdi 400520: 48 39 c7 cmp %rax,%rdi 400523: 75 eb jne 400510 <calculate_sse+0x20> 400525: f3 c3 repz retq 400527: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) -Øystein
