What does Movaps do?
movaps. The movaps instruction moves four single-precision floating-point values between two XMM registers, or between XMM registers and memory. When moving to or from memory, a general protection fault will occur unless the address is aligned to a 16-byte boundary.
What is Movups?
MOVUPS — Move Unaligned Packed Single-Precision Floating-Point Values. Move unaligned packed single-precision floating-point from xmm2/mem to xmm1.
What is xmm0 register?
xmm0 is used to return values from functions, and as the first function argument. They’re *all* scratch registers; a perfectly anarchist setup. Save things to memory before calling any functions, because everything can get trashed! A brand new set of instructions, like “movss” and “addss”.
What is MOVQ Assembly?
movq (assuming you’re talking about x86) is a move of a quadword (64-bit value). This particular instruction: movq (%rsp), %rsp. looks very much like code that will walk up through stack frames.
What is SSE x86?
In computing, Streaming SIMD Extensions (SSE) is a single instruction, multiple data (SIMD) instruction set extension to the x86 architecture, designed by Intel and introduced in 1999 in their Pentium III series of Central processing units (CPUs) shortly after the appearance of Advanced Micro Devices (AMD’s) 3DNow!.
What is AVX and SSE?
SSE (streaming SIMD extensions) and AVX (advanced vector extensions) are SIMD (single instruction multiple data streams) instruction sets supported by recent CPUs manufactured in Intel and AMD. This SIMD programming allows parallel processing by multiple cores in a single CPU.
What is the difference between Lea and MOV?
LEA stands for Load Effective Address. It takes the result from address generation, and puts that result directly in a register, without accessing memory. MOV , on the other hand, will move data to or from memory at the computed offset.
What is the difference between MOV and MOVQ?
movq and movl are variations of the mov command (moving data to a memory location or a register). movq moves 8 bytes starting at the current specified memory address whereas movl moves 4 bytes starting at the current specificed memory address.
Are XMM registers caller saved?
xmm8 is caller-save in both, but I’d give you a different reference.