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Sign-extend 32-bit value in EAX to 64-bit value in EDX:EAX. Mainly used to prepare a dividend for the 32-bit IDIV (signed divide) instruction. CWD: JECXZ rel8: E3 cb [f] Jump if ECX is zero: JCXZ: PUSHAD: 60: Push all 32-bit registers onto stack [g] PUSHA: POPAD: 61: Pop all 32-bit general-purpose registers off stack [h] POPA: PUSHFD: 9C: Push ...
Typically push and pop are translated into multiple micro-ops, to separately add/subtract the stack pointer, and perform the load/store in memory. [3] Newer processors contain a dedicated stack engine to optimize stack operations. Pentium M was the first x86 processor to introduce a stack engine.
The Small Device C Compiler (SDCC) is a free-software, partially retargetable [1] C compiler for 8-bit microcontrollers. It is distributed under the GNU General Public License. The package also contains an assembler, linker, simulator and debugger. SDCC is a popular open-source C compiler for microcontrollers compatible with Intel 8051/MCS-51 ...
ANL C, bit, ANL C, / bit: And the bit (or its complement) to the carry bit A bit operand is written in the form address.number . Because the carry flag is bit 7 of the bit-addressable program status word, the SETB C , CLR C and CPL C instructions are shorter equivalents to SETB PSW.7 , CLR PSW.7 and CPL PSW.7 .
The 32-bit flat memory model of the 80386's extended protected mode may be the most important feature change for the x86 processor family until AMD released x86-64 in 2003, as it helped drive large scale adoption of Windows 3.1 (which relied on protected mode) since Windows could now run many applications at once, including DOS applications, by ...
MCU 8051 IDE is a free software integrated development environment for microcontrollers based on the 8051. MCU 8051 IDE has a built-in simulator not only for the MCU itself, but also LCD displays and simple LED outputs as well as button inputs.
The pushd ('push directory') command saves the current working directory to the stack then changes the working directory to the new path input by the user. If pushd is not provided with a path argument , in Unix it instead swaps the top two directories on the stack, which can be used to toggle between two directories.
POD return values 33–64 bits in size are returned via the EAX:EDX registers. Non-POD return values or values larger than 64-bits, the calling code will allocate space and passes a pointer to this space via a hidden parameter on the stack. The called function writes the return value to this address. Stack aligned on 4-byte boundary. stdcall ...