Microsoft KB Archive/26624: Difference between revisions
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Latest revision as of 19:20, 12 August 2020
Invalid BSF MASM Instruction Assembles Incorrectly ID Number: Q26624
5.00 MS-DOS
Summary:
The following two instructions are not valid MASM instructions:
BSF AX,EAX BSF AX,VAR1
The variable “VAR1” is a 32-bit variable. The “BSF AX,EAX” instruction encodes incorrectly to “0F BC C1” (which is the correct encoding for “BSF AX,CX”). The “BSF AX,VAR1” instruction encodes incorrectly to “0F BC 05 00000000” (the correct encoding for “BSFeax,VAR1”).
This feature is under review and will be considered for inclusion in a future release.
