Chapter 12
Toolchain Primer
Abstract
This chapter covers the fundamentals of the various toolchains and ABIs for Linux. This provides developers with the necessary information to understand concepts such as PIC, calling conventions, alignment, and so on. Additionally, techniques are provided for helping the compiler optimize code better, for how to dispatch multiple optimized implementations of code based on the supported CPU features, and for how to leverage x86 assembly.
Keywords
ELF
x86
x86-64
PIC
CPU dispatch
Function dispatch
IFUNC
gcc
as
ld
icc
clang
llvm
nasm
yasm
at&t syntax
CPUID
C99
C11
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