Peter Johnson 2fe53b2c29 Revert r2029. According to both AMD64 and Intel 64 instruction set ... references, REX + 90h opcode is not NOP, but a valid XCHG: "The x86 architecture commonly uses the XCHG EAX, EAX instruction (opcode 90h) as a one-byte NOP. In 64-bit mode, the processor treats opcode 90h as a true NOP only if it would exchange rAX with itself. Without this special handling, the instruction would zero-extend the upper 32 bits of RAX, and thus it would not be a true nooperation. Opcode 90h can still be used to exchange rAX and r8 if the appropriate REX prefix is used." Noticed by: nasm64developer@users.sf.net svn path=/trunk/yasm/; revision=2031		2008-02-02 19:23:17 +00:00
..
arch	Revert r2029. According to both AMD64 and Intel 64 instruction set	2008-02-02 19:23:17 +00:00
dbgfmts	Fix #123: Be explicit that errors are such by printing "error:" at beginning	2007-12-04 06:19:07 +00:00
listfmts	Merge bc-int.h into bytecode.h, removing YASM_BC_INTERNAL in the process.	2007-07-14 04:34:41 +00:00
objfmts	Make jmp with seg:off equ behave the same as NASM.	2008-01-19 08:59:19 +00:00
parsers	Make jmp with seg:off equ behave the same as NASM.	2008-01-19 08:59:19 +00:00
preprocs	Fix #123: Be explicit that errors are such by printing "error:" at beginning	2007-12-04 06:19:07 +00:00
Makefile.inc	Create new working branch for new (Robertson 1977) optimizer.	2005-10-08 05:45:29 +00:00