new_ia32-branch: deprecated instructions

new_ia32-branch: deprecated instructions

[Toshiyasu Morita]

I still see the new_ia32_branch generating read/modify/write instructions
to memory. Here's a few samples from stress-1.12/decompress.i compiled
at -O2 -march=pentiumpro:

...
 1998 108e 8B0B                 movl    (%ebx), %ecx
 1999 1090 8B461C               movl    28(%esi), %eax
 2000 1093 0FB611               movzbl  (%ecx), %edx
 2001 1096 C1E008               sall    $8, %eax
 2002 1099 41                   incl    %ecx
 2003 109a 83462008             addl    $8, 32(%esi)
 2004 109e 890B                 movl    %ecx, (%ebx)
 2005 10a0 09D0                 orl     %edx, %eax
 2006 10a2 89461C               movl    %eax, 28(%esi)
 2007 10a5 FF4B04               decl    4(%ebx)			<- here
 2008 10a8 FF4308               incl    8(%ebx)			<- here
...
 2050 1115 8B1E                 movl    (%esi), %ebx
 2051 1117 8B4304               movl    4(%ebx), %eax
 2052 111a 85C0                 testl   %eax, %eax
 2053 111c 0F840E0E             je      .L624
 2053      0000
 2054 1122 8B0B                 movl    (%ebx), %ecx
 2055 1124 8B461C               movl    28(%esi), %eax
 2056 1127 0FB611               movzbl  (%ecx), %edx
 2057 112a C1E008               sall    $8, %eax
 2058 112d 41                   incl    %ecx
 2059 112e 83462008             addl    $8, 32(%esi)		<- here
 2060 1132 890B                 movl    %ecx, (%ebx)
 2061 1134 09D0                 orl     %edx, %eax
 2062 1136 89461C               movl    %eax, 28(%esi)
 2063 1139 FF4B04               decl    4(%ebx)			<- here
 2064 113c FF4308               incl    8(%ebx)			<- here
 2065 113f 8B4620               movl    32(%esi), %eax
 2066 1142 83F800               cmpl    $0, %eax
 2067 1145 7ECE                 jle     .L322
 2068 1147 8B5E1C               movl    28(%esi), %ebx
 2069 114a 8D48FF               leal    -1(%eax), %ecx
 2070 114d 894E20               movl    %ecx, 32(%esi)
 2071 1150 D3EB                 shrl    %cl, %ebx
 2072 1152 83E301               andl    $1, %ebx
 2073 1155 895D90               movl    %ebx, -112(%ebp)
 2074                   .L564:
 2075 1158 C1659401             sall    $1, -108(%ebp)
 2076 115c 8B7D90               movl    -112(%ebp), %edi
 2077 115f 8B4598               movl    -104(%ebp), %eax
 2078 1162 8B5584               movl    -124(%ebp), %edx
 2079 1165 097D94               orl     %edi, -108(%ebp)	<- here
 2080 1168 8B4D94               movl    -108(%ebp), %ecx
 2081 116b 3B0C82               cmpl    (%edx,%eax,4), %ecx
 2082 116e 7F80                 jg      .L317
 2083                   .L563:
 2084 1170 8B5D98               movl    -104(%ebp), %ebx
 2085 1173 8B7D80               movl    -128(%ebp), %edi
 2086 1176 8B4594               movl    -108(%ebp), %eax
3182:decompress.i  ****
3183:decompress.i  ****       while (((Bool)1) ) {
3184:decompress.i  ****
3185:decompress.i  ****          if (nextSym == EOB) break;
...


Toshi