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lodsb is OK to use in branch filter

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modified:   stub/src/arch/i386/bxx.S
This commit is contained in:
John Reiser 2024-10-26 09:50:38 -07:00
parent 8aa3679323
commit b10d2b7365
1 changed files with 2 additions and 5 deletions
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7
src/stub/src/arch/i386/bxx.S
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@ -52,8 +52,7 @@ ckloop4:
cmpl %ecx,%esi; jae ckend cmpl %ecx,%esi; jae ckend
push %esi # tail merge push %esi # tail merge
ckloop3: ckloop3:
pop %esi; movzbl (%esi),%eax # next main opcode pop %esi; lodsb # next main opcode
lea 1(%esi),%esi # avoid lodsb because Read-Modify-Write of %eax
cmpb $0x49,%dh; jne ckloop2 # do not consider 6-byte conditional jxx cmpb $0x49,%dh; jne ckloop2 # do not consider 6-byte conditional jxx
cmpb $0x80,%al; jb ckloop2 # lo of 6-byte Jcc cmpb $0x80,%al; jb ckloop2 # lo of 6-byte Jcc
cmpb $0x8F,%al; ja ckloop2 # hi of 6-byte Jcc cmpb $0x8F,%al; ja ckloop2 # hi of 6-byte Jcc
@ -72,9 +71,7 @@ ckmark:
stosl stosl
ckstart: ckstart:
cmpl %ecx,%esi; jae ckend cmpl %ecx,%esi; jae ckend
movzbl (%esi),%eax lodsb; jmp ckloop2 # 0x0F prefix would overlap previous displacement
lea 1(%esi),%esi
jmp ckloop2 # 0x0F prefix would overlap previous displacement
ckend: ckend:
pop %edi pop %edi
pop %esi pop %esi