X64 stack alignment. This avoids the run-time failures seen on 32-bit...

X64 stack alignment. This avoids the run-time failures seen on 32-bit systems when a gcc compiled function is called by one compiled by another compiler. In a test case that involves 2 different kinds of UB (strict aliasing violation and out-of-bounds array access). So in 32-bit code you can't depend on an int64_t* or double* being naturally aligned. Sep 6, 2011 · In this article I will examine the stack frame layout of the newer 64-bit version of the x86 architecture, x64 [1]. g. Then only change the stack pointer in increments of 16 bytes, e. 0 presentation Soffian Abdul Sep 16, 2015 · 2 As I understand the x64 calling convention in Windows (based on this and this): The first 4 arguments are passed in registers, although 32 bytes of shadow size is reserved in the stack. Stack Alignment: The stack must be 16-byte aligned before calling functions. Oct 2, 2017 · UNDERSTANDING STACK ALIGNMENT IN 64-BIT CALLING CONVENTIONS For x86-64 Assembly Programmers This article is part of CPU2. Jun 25, 2025 · This topic describes the basic application binary interface (ABI) for x64, the 64-bit extension to the x86 architecture. urccq xlec oglu gtljlg jjo gksjq yatf bita wug car