Nicolas Brunie nibrunie

nibrunie / vfrec7_bf16.c

Created February 8, 2025 16:48

Test program to list inputs for which vfrec7.v approximation is inexact in BFloat16

	/** Determining when RVV 1.0 vfrev7.v SEW=32 result can not be converted
	* exactly to a BF16 value. */
	#include <stdio.h>
	#include <stdint.h>
	#include <inttypes.h>


	typedef union {
	float f;
	uint32_t u;

nibrunie / vcrypto-lmul-alignment-test-case.c

Created September 22, 2024 20:56

[riscv-isa-sim] Simple test case for RISC-V vector crypto unaligned LMUL register indices

	#include <stdio.h>

	// How to build:
	// riscv64-unknown-elf-gcc -march=rv64gcv_zvkned_zvksed_zvkg_zvknhb_zvksh_zvl128b vcrypto-lmul-alignment-test-case.c
	// How to execute:
	// spike --isa=rv64gcv_zvbc_zicntr_zihpm_zvkned_zvksed_zvkg_zvknhb_zvksh_zvl128b <pk-image> a.out


	// This program aims at demonstrating that spike is flawed when
	// it comes to executing vector crypto instructions with invalid register

nibrunie / fp8Formats.py

Last active March 12, 2024 15:32

python generator to list values of various FP8 formats

	# -- coding: utf-8 --

	# this script generates values for different 8-bit floating point formats

	def bitMask(width):
	""" generate a <width> wide bitmask """
	return 2**width - 1

	class FP8Fomat:
	expBits = None # exponent field width (in bits)

nibrunie / matrix_transpose.c

Created November 7, 2023 22:26

Toy example of vslide based 4x4 e32 matrix transpose in RVV