[Bug rtl-optimization/20972] Register allocator/reload uses auto-inc register in non-addressing operand

[hubicka at gcc dot gnu dot org]

------- Comment #11 from hubicka at gcc dot gnu dot org  2008-09-06 12:02 -------
Also just noticed that offline copy of longest-match get extra move:
.L15:   
        movzbl  2(%eax), %edi   #, tmp87
        leal    2(%eax), %ecx   #, scan.158
        movl    %edi, %edx      # tmp87,
        cmpb    2(%ebx), %dl    #,
        jne     .L6     #,
        movzbl  3(%eax), %edi   #, tmp88
        leal    3(%eax), %ecx   #, scan.158
        movl    %edi, %edx      # tmp88,
        cmpb    3(%ebx), %dl    #,
        jne     .L6     #,      
        movzbl  4(%eax), %edi   #, tmp89
        leal    4(%eax), %ecx   #, scan.158
        movl    %edi, %edx      # tmp89,
        cmpb    4(%ebx), %dl    #,
        jne     .L6     #,
        movzbl  5(%eax), %edi   #, tmp90
        leal    5(%eax), %ecx   #, scan.158
        movl    %edi, %edx      # tmp90,
        cmpb    5(%ebx), %dl    #,
        jne     .L6     #,

while inlined copy is fine:
.L98:   
        movzbl  1(%eax), %edx   #,
        leal    1(%eax), %edi   #, scan
        cmpb    1(%ecx), %dl    #,
        jne     .L161   #,
        movzbl  2(%eax), %edx   #,
        leal    2(%eax), %edi   #, scan
        cmpb    2(%ecx), %dl    #,
        jne     .L161   #,
        movzbl  3(%eax), %edx   #,
        leal    3(%eax), %edi   #, scan
        cmpb    3(%ecx), %dl    #,
        jne     .L161   #,
        movzbl  4(%eax), %edx   #,
        leal    4(%eax), %edi   #, scan
        cmpb    4(%ecx), %dl    #,
        jne     .L161   #,
interesting :)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20972