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// Copyright 2026 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package riscv64
import "testing"
func extractBitsOne(t *testing.T, from uint32, start, size uint, expect uint32) {
ret := extractBits(from, start, size)
if ret != expect {
t.Fatalf("extractBits(%08x, %d, %d) = %x, want %x",
from, start, size, ret, expect)
}
}
func TestExtractBits(t *testing.T) {
extractBitsOne(t, 0, 0, 0, 0)
extractBitsOne(t, 0xffffffff, 0, 0, 0)
for i := uint(0); i <= 31; i++ {
extractBitsOne(t, 0xffffffff, i, 1, 1)
}
extractBitsOne(t, 0xf0f0f0f0, 31, 5, 0b11110)
extractBitsOne(t, 0xf0f0f0f0, 25, 4, 0b0011)
extractBitsOne(t, 0xf0f0f0f0, 21, 4, 0b1100)
val := uint32(0b0000000_00011_00010_000_00001_0110011)
extractBitsOne(t, val, 24, 5, 3)
extractBitsOne(t, val, 19, 5, 2)
extractBitsOne(t, val, 11, 5, 1)
}
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