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diff --git a/README09b.txt b/README09b.txt deleted file mode 100644 index affb91a..0000000 --- a/README09b.txt +++ /dev/null @@ -1,82 +0,0 @@ - - README - NASM, the Netwide Assembler - - - Changes from 0.98.07 release to 98.09b as of 28-Oct-2001 - ======================================================== - -1. More closely compatible with 0.98 when -O0 is implied -or specified. Not strictly identical, since backward -branches in range of short offsets are recognized, and signed -byte values with no explicit size specification will be -assembled as a single byte. - -2. More forgiving with the PUSH instruction. 0.98 requires -a size to be specified always. 0.98.09b will imply the size -from the current BITS setting (16 or 32). - -3. Changed definition of the optimization flag: - - -O0 strict two-pass assembly, JMP and Jcc are - handled more like 0.98, except that back- - ward JMPs are short, if possible. - - -O1 strict two-pass assembly, but forward - branches are assembled with code guaranteed - to reach; may produce larger code than - -O0, but will produce successful assembly - more often if branch offset sizes are not - specified. - - -O2 multi-pass optimization, minimize branch - offsets; also will minimize signed immed- - iate bytes, overriding size specification. - - -O3 like -O2, but more passes taken, if needed - - - Changes from 0.98 release to 98.03 as of 27-Jul-2000 - ==================================================== - -1. Added signed byte optimizations for the 0x81/0x83 class -of instructions: ADC, ADD, AND, CMP, OR, SBB, SUB, XOR: -when used as 'ADD reg16,imm' or 'ADD reg32,imm.' Also -optimization of signed byte form of 'PUSH imm' and 'IMUL -reg,imm'/'IMUL reg,reg,imm.' No size specification is needed. - -2. Added multi-pass JMP and Jcc offset optimization. Offsets -on forward references will preferentially use the short form, -without the need to code a specific size (short or near) for -the branch. Added instructions for 'Jcc label' to use the -form 'Jnotcc $+3/JMP label', in cases where a short offset -is out of bounds. If compiling for a 386 or higher CPU, then -the 386 form of Jcc will be used instead. - -This feature is controlled by a new command-line switch: "O", -(upper case letter O). "-O0" reverts the assembler to no -extra optimization passes, "-O1" allows up to 5 extra passes, -and "-O2"(default), allows up to 10 extra optimization passes. - -3. Added a new directive: 'cpu XXX', where XXX is any of: -8086, 186, 286, 386, 486, 586, pentium, 686, PPro, P2, P3 or -Katmai. All are case insensitive. All instructions will -be selected only if they apply to the selected cpu or lower. -Corrected a couple of bugs in cpu-dependence in 'insns.dat'. - -4. Added to 'standard.mac', the "use16" and "use32" forms of -the "bits 16/32" directive. This is nothing new, just conforms -to a lot of other assemblers. (minor) - -5. Changed label allocation from 320/32 (10000 labels @ 200K+) -to 32/37 (1000 labels); makes running under DOS much easier. -Since additional label space is allocated dynamically, this -should have no effect on large programs with lots of labels. -The 37 is a prime, believed to be better for hashing. (minor) - -6. Integrated patchfile 0.98-0.98.01. I call this version -0.98.03, for historical reasons: 0.98.02 was trashed. - ---John Coffman <johninsd@san.rr.com> 27-Jul-2000 - -(end)
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