[Bug rtl-optimization/19464] [3.3/3.4/4.0 Regression] gcse causes poor register allocation

[steven at gcc dot gnu dot org]

------- Additional Comments From steven at gcc dot gnu dot org  2005-01-21 12:51 -------
With my patch I get almost perfect code for amd64: 
 
.globl f 
        .type   f, @function 
f: 
.LFB2: 
        decl    %edi 
        je      .L6 
        movl    r5(%rip), %r9d 
        movl    r4(%rip), %r8d 
        xorl    %r10d, %r10d 
        movl    r3(%rip), %esi 
        movl    r2(%rip), %ecx 
        movl    r0(%rip), %edx 
        movl    r1(%rip), %eax 
        .p2align 4,,7 
.L4: 
        addl    %edx, %eax 
        incl    %r10d 
        addl    %eax, %ecx 
        addl    %ecx, %esi 
        addl    %esi, %r8d 
        addl    %r8d, %r9d 
        addl    %r9d, %edx 
        cmpl    %r10d, %edi 
        jne     .L4 
        movl    %r9d, r5(%rip) 
        movl    %r8d, r4(%rip) 
        movl    %esi, r3(%rip) 
        movl    %ecx, r2(%rip) 
        movl    %edx, r0(%rip) 
        movl    %eax, r1(%rip) 
.L6: 
        rep ; ret 
 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19464