Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →ILP32 is a data-model name: C and C++ int, long, and object pointers are each 32 bits (4 bytes). It does not, by itself, describe an entire application binary interface (ABI); the ABI also defines calling conventions, object-file rules, register use, and platform-specific types. On RISC-V, the current specification associates ILP32-family ABIs with RV32-family instruction-set architectures (ISAs), while LP64-family ABIs are associated with RV64.
What ILP32 means
The letters identify the widths of three C data types:
I—intis 32 bits.LP—longand pointers are 32 bits.32— the model’s word size is 32 bits for those types.
In the RISC-V C/C++ type table, int, long, and void * are 4 bytes, with 4-byte alignment. That table also specifies a 2-byte short, 8-byte long long, 8-byte double, and 16-byte long double; ILP32 does not make every C type 32-bit. See the RISC-V C/C++ type details.
Because a data model covers type widths rather than every binary-interface rule, two platforms can both use ILP32 while differing in calling convention, register assignments, object-file flags, or operating-system conventions.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall#1 Best Overall
- Flexible MCU Board: Incorporate the ESP32-C3 32-bit RISC-V chip, operating up to 160 MHz, mounted multiple development ports,
- Developer Friendly: Compatible with Arduino IDE, MicroPython, CircuitPython, PlatformIO, ESP IDF, Zephyr, Matter, ESPNow, Meshtastic, WLED, ESPHome, Home Assistant, Ubidots
- Outstanding RF performance: Complete Wi-Fi functions and Bluetooth Low Energy, while supporting communication over 100m with anFL antenna
- Elaborate Power Design: 4 working modes as low as 44 μA in deep sleep mode, while supporting lithium battery charge management
- Thumb-sized Design: 21 x 17.5mm, Seeed Studio XIAO series classic form factor
Is ILP32 a 32-bit ABI?
It is commonly described as a 32-bit ABI, but that shorthand needs qualification. ILP32 guarantees 32-bit int, long, and pointers; the complete ABI includes additional rules. The architecture and ABI must therefore be named together when discussing compatibility.
For RISC-V, the procedure-calling-convention specification states: “The ILP32* ABIs are only compatible with RV32* ISAs, and the LP64* ABIs are only compatible with RV64* ISAs.” This is a RISC-V rule, not a universal statement about every processor family. The wording appears in section 2.1.4 of the RISC-V procedure-calling-convention specification.
Rank #2
- CH32V003 Development Minimum System Board for Nano RISC-V CH32V003F4U6 Chip TYPE-C USB 22Pin
- on-board 24MHz Crystal oscillator
- Power by TYPE-C USB
ILP32 variants on RISC-V
RISC-V names several ILP32-family ABIs. The suffix identifies the floating-point calling convention or the reduced embedded register set.
| ABI | Compatible ISA family | Calling-convention feature | RISC-V status |
|---|---|---|---|
ILP32 |
RV32 | Integer calling convention; no hardware floating-point argument convention | Ratified |
ILP32F |
RV32 with single-precision floating-point support | Hardware floating-point convention with ABI_FLEN = 32 | Ratified |
ILP32D |
RV32 with double-precision floating-point support | Hardware floating-point convention with ABI_FLEN = 64 | Ratified |
ILP32E |
RV32E embedded ISA | Reduced-register embedded convention; uses the RISC-V embedded ELF flag | Draft |
The compatibility and calling-convention definitions are in RISC-V’s procedure-calling-convention specification. The ratified-versus-draft labels come from the RISC-V ABI status page.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Rank #3
- The ESP32-C3 SUPERMINI is positioned as a high-performance, low-power, cost-effective IoT mini development board, suitable for low-power IoT applications and wireless wearable applications
- It is equipped with a rich set of interfaces, including 11 digital I/Os that can be used as PWM pins and 4 analog I/Os that can be used as ADC pins.
- It supports four serial interfaces, including UART, I2C, and SPI.
- The ESP32-C3 features a 32-bit RISC-V CPU, including an FPU (Floating Point Unit) capable of 32-bit single-precision
- Package: 2PCS ESP32-C3 MINI Development Board ESP32 SuperMini ESP32 C3 WiFi Module
ILP32 versus LP64
Both models keep int at 32 bits. The difference is the width of long and pointers.
| Type or property | ILP32 | LP64 |
|---|---|---|
int |
32 bits (4 bytes) | 32 bits (4 bytes) |
long |
32 bits (4 bytes) | 64 bits (8 bytes) |
| Object pointers | 32 bits (4 bytes) | 64 bits (8 bytes) |
| Typical RISC-V ISA pairing | RV32 | RV64 |
LP64 does not mean every type is 64 bits: in the RISC-V table, int remains 32 bits, while types such as long long and floating-point types have their own specified sizes. Likewise, not every 64-bit operating system must use LP64; other data models exist outside the RISC-V rules summarized here.
Rank #4
- ESP32-C6 WiFi 6 microcontroller development board adopts ESP32-C6-WROOM-1-N8 module, which is equipped with RISC-V 32-bit single-core processor, up to 160MHz main frequency, built-in 8MB Flash
- Integrates WiFi 6, Bluetooth 5 and and IEEE 802.15.4 (Zigbee 3.0 and Thread) wireless communication, with superior RF performance
- Integrates rich peripherals including SPI, UART, I2C, I2S, LED PWM, SDIO and other interfaces, compatible with the pinout of ESP32-C6-DevKitC-1-N8 development board, more convenient to use and expand a variety of peripheral modules
- Onboard CH343 and CH334 USB HUB chips, supports USB and UART development at the same time via a USB-C port
- Comes with online examples and tutorials for ESP-IDF development environment
Can a 64-bit processor run an ILP32 ABI?
That depends on the architecture and operating-system toolchain. A 64-bit CPU can, in principle, execute code using narrower data types if its architecture and ABI define such a mode. However, the current RISC-V ABI specification does not define ILP32 for RV64: its named ABI compatibility rule pairs ILP32-family ABIs with RV32-family ISAs and LP64-family ABIs with RV64-family ISAs.
Therefore, for RISC-V, do not infer that an RV64 processor can select a standard ILP32 RISC-V ABI simply because the hardware can perform 32-bit operations. Check the exact ISA, ABI, compiler multilibs, linker, libraries, and operating-system support supplied by the platform.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsBest Value
- Ample PSRAM Storage – The development board offers 8MB PSRAM, providing substantial extra memory for handling more complex tasks, large data buffers, and advanced processing.
- Enhanced Multi-Tasking Capability – With the additional 8MB PSRAM, the ESP32-C5-WIFI6-KIT can efficiently manage multiple protocol stacks simultaneously, ensuring smooth operation in multi-tasking IoT environments.
- Support for Medium-Load Applications – The 8MB PSRAM allows the ESP32-C5 to handle medium-load applications more effectively, making it ideal for scenarios requiring real-time data processing or continuous communication.
- Seamless Performance – The increased memory improves the overall performance and responsiveness of the device, particularly when running applications with larger memory footprints or more demanding computations.
- Future-Proof for Complex Projects – With 8MB of PSRAM, developers are better equipped to build scalable, high-performance solutions that support both current and future IoT use cases, offering flexibility for future-proofing designs.
What the ABI controls beyond type widths
When compiling or linking, the ABI determines details that the ILP32 label alone cannot answer:
- Which registers carry integer, pointer, and floating-point arguments.
- How return values are placed in registers or memory.
- Stack alignment and layout at a call boundary.
- How structures, unions, and variadic arguments are passed.
- Object-file and ELF flags used to reject incompatible objects.
- Platform conventions for types and system interfaces.
This is why ILP32, ILP32F, and ILP32D are separate ABI names even though they share the same basic integer and pointer widths.
Linux-specific type details
An operating-system ABI can add rules beyond the generic data model. In the RISC-V Linux-specific ABI, wchar_t and wint_t are 4 bytes, with no ILP32-versus-LP64 distinction for those two types. Those definitions apply to that Linux ABI and should not be generalized to every ILP32 platform. See the RISC-V Linux-specific ABI.
Quick Recap
Common mistakes when reading “ILP32”
- Assuming every type is 32-bit:
short,long long, floating-point types, and alignment can have different values. - Equating CPU width with pointer width: name the architecture and ABI; do not infer one from the other.
- Calling ILP32E ratified: the RISC-V status page currently labels it draft.
- Applying Linux rules everywhere: operating-system type definitions are platform-specific.
- Promising a performance gain: narrower pointers can affect memory use, but performance depends on the workload, implementation, libraries, and toolchain; the ABI label alone is not a benchmark.
How to identify an ILP32 build
- Identify the target ISA (for RISC-V, RV32 or RV64).
- Read the compiler’s target ABI option or configuration; distinguish
ilp32,ilp32f,ilp32d, andilp32ewhere supported. - Inspect the produced object with the platform’s ELF inspection tools and verify its ABI flags.
- Ensure every linked library was built for the same ISA and ABI variant; matching only the instruction-set family is insufficient.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
