[Bug target/14552] compiled trivial vector intrinsic code is ineffiencent

[pluto at agmk dot net]

------- Comment #16 from pluto at agmk dot net  2005-11-21 11:29 -------
without Uros' mmx-patch the gcc-4.1.0-20051113 generates amazing code:
(gcc -O3 -march=pentium3 -S -fomit-frame-pointer pr14552.c)

test:   subl    $20, %esp
        movl    w, %eax
        movl    w+4, %edx
        movl    %ebx, 8(%esp)
        movl    %esi, 12(%esp)
        movl    %eax, (%esp)
        movl    %edx, 4(%esp)
        movswl  (%esp),%esi
        movl    %edi, 16(%esp)
        movswl  4(%esp),%ecx
        movswl  2(%esp),%edi
        movswl  6(%esp),%ebx
        addl    %esi, %esi
        addl    %ecx, %ecx
        movzwl  %si, %esi
        sall    $17, %edi
        movzwl  %cx, %ecx
        sall    $17, %ebx
        movl    %edi, %eax
        movl    16(%esp), %edi
        movl    %ebx, %edx
        orl     %esi, %eax
        movl    8(%esp), %ebx
        orl     %ecx, %edx
        movl    12(%esp), %esi
        movl    %eax, w
        movl    %edx, w+4
        movl    w, %eax
        movl    w+4, %edx
        movl    %eax, dw
        movl    %edx, dw+4
        addl    $20, %esp
        ret
        .size   test, .-test
        .comm   dw,8,8
        .comm   w,8,8
        .ident  "GCC: (GNU) 4.1.0 20051113 (experimental)"
        .section        .note.GNU-stack,"",@progbits


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14552