/* SPDX-License-Identifier: GPL-2.0-only */ #include <types.h> /* * Provide platform-independent backend implementation for __builtin_clz() in * <lib.h> in case GCC does not have an assembly version for this arch. */ /* * FIXME * work around lack of --gc-sections on x86 * defined in rv32 libgcc.a */ #if !ENV_X86 && !ENV_RISCV int __clzsi2(u32 a); int __clzsi2(u32 a) { static const u8 four_bit_table[] = { [0x0] = 4, [0x1] = 3, [0x2] = 2, [0x3] = 2, [0x4] = 1, [0x5] = 1, [0x6] = 1, [0x7] = 1, [0x8] = 0, [0x9] = 0, [0xa] = 0, [0xb] = 0, [0xc] = 0, [0xd] = 0, [0xe] = 0, [0xf] = 0, }; int r = 0; if (!(a & (0xffffU << 16))) { r += 16; a <<= 16; } if (!(a & (0xffU << 24))) { r += 8; a <<= 8; } if (!(a & (0xfU << 28))) { r += 4; a <<= 4; } return r + four_bit_table[a >> 28]; } #endif