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New posts in x86
x86 Program Counter abstracted from microarchitecture?
Mar 13, 2022
x86
cpu-architecture
riscv
instruction-set
program-counter
Is it possible to vectorize myNum += a[b[i]] * c[i]; on x86_64?
Apr 16, 2022
x86
x86-64
sse
simd
vectorization
About setjmp/longjmp
Nov 06, 2022
c
linux
x86
setjmp
Porting compiler from x86 Assembly to LLVM
Nov 19, 2022
c++
assembly
compiler-construction
x86
llvm
What's the difference between __popcnt() and _mm_popcnt_u32()?
Feb 11, 2020
x86
sse
intrinsics
sse4
What's inside the stack?
Oct 21, 2022
c
x86
stack
low-level
What is the overhead of using Intel Last Branch Record?
Apr 02, 2022
x86
intel
trace
branch-prediction
intel-pmu
Do the x86 virtualization instruction sets (VT-x, AMD-V) have alternate uses?
Jan 28, 2022
virtualization
x86
Is vxorps-zeroing on AMD Jaguar/Bulldozer/Zen faster with xmm registers than ymm?
Jan 06, 2022
assembly
x86
avx
micro-optimization
amd-processor
what's the difference between _mm256_lddqu_si256 and _mm256_loadu_si256
Feb 04, 2022
x86
simd
intrinsics
avx
micro-optimization
Two very similar functions involving sin() exhibit vastly different performance -- why?
Oct 29, 2022
c
performance
gcc
floating-point
x86
L1 memory bandwidth: 50% drop in efficiency using addresses which differ by 4096+64 bytes
May 02, 2022
c
caching
memory
x86
avx
is there an inverse instruction to the movemask instruction in intel avx2?
Dec 05, 2021
x86
intrinsics
avx
avx2
icc
Is integer overflow undefined in inline x86 assembly?
Apr 05, 2022
c
gcc
x86
undefined-behavior
128-bit values - From XMM registers to General Purpose
Dec 07, 2021
assembly
x86
sse
Why does DOS set the SP register to 0xFFFE after loading a .COM file?
Oct 30, 2022
assembly
x86
dos
x86-16
callstack
Concrete example of incorrect behavior of an early-clobber affecting a memory operand's addressing mode in GCC inline asm?
Sep 07, 2022
assembly
gcc
x86
inline-assembly
register-allocation
Is it possible to use 32 bits registers/instructions in real mode?
Nov 15, 2022
assembly
x86
operating-system
real-mode
Slow jmp-instruction
Oct 16, 2022
assembly
x86
intel
cpu-architecture
branch-prediction
Why does cmp 0x84,0x30 trigger the overflow flag?
Nov 14, 2022
assembly
x86
eflags
signed-overflow
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