[Bug optimization/15241] [tree-ssa] Convert a <= 7 && b <= 7 into (a | b) <= 7.

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-05-01 13:10 -------
On PPC the former is much worse than the later:
_foo:
        subfic r3,r3,7
        li r3,0
        adde r3,r3,r3 // <-- r3 == r3 <=7 on some processors this is serializing
        subfic r4,r4,7
        li r4,0
        adde r4,r4,r4 // <--r4 == r4 <=7 on some processors this is serializing
        and. r0,r3,r4 // r0 = r4 & r3, cr0 = (rs3 & r4) == 0
        beqlr- cr0  // return if cr0(equal) is true
        b L_baz$stub
        .align 2
        .globl _bar
_bar:
        or r4,r3,r4
        cmplwi cr7,r4,7
        bgtlr- cr7
        b L_baz$stub

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15241