On some target machines, GCC supports many built-in functions specific to those machines. Generally these generate calls to specific machine instructions, but allow the compiler to schedule those calls.

• AArch64 Built-in Functions
• Alpha Built-in Functions
• Altera Nios II Built-in Functions
• ARC Built-in Functions
• ARC SIMD Built-in Functions
• ARM iWMMXt Built-in Functions
• ARM C Language Extensions (ACLE)
• ARM Floating Point Status and Control Intrinsics
• ARM ARMv8-M Security Extensions
• AVR Built-in Functions
• Blackfin Built-in Functions
• BPF Built-in Functions
• FR-V Built-in Functions
• LoongArch Base Built-in Functions
• LoongArch SX Vector Intrinsics
• LoongArch ASX Vector Intrinsics
• MIPS DSP Built-in Functions
• MIPS Paired-Single Support
• MIPS Loongson Built-in Functions
• MIPS SIMD Architecture (MSA) Support
• Other MIPS Built-in Functions
• MSP430 Built-in Functions
• NDS32 Built-in Functions
• Nvidia PTX Built-in Functions
• Basic PowerPC Built-in Functions
• PowerPC AltiVec/VSX Built-in Functions
• PowerPC Hardware Transactional Memory Built-in Functions
• PowerPC Atomic Memory Operation Functions
• PowerPC Matrix-Multiply Assist Built-in Functions
• PRU Built-in Functions
• RISC-V Built-in Functions
• RISC-V Vector Intrinsics
• CORE-V Built-in Functions
• RX Built-in Functions
• S/390 System z Built-in Functions
• SH Built-in Functions
• SPARC VIS Built-in Functions
• TI C6X Built-in Functions
• x86 Built-in Functions
• x86 Transactional Memory Intrinsics
• x86 Control-Flow Protection Intrinsics