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math.big: stronger asserts to reduce risks of aliasing

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unplanned 2025-12-04 01:05:17 +01:00
parent 73e82332d0
commit 688af04725
1 changed files with 7 additions and 0 deletions
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7
lib/std/math/big/int.zig
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@ -3630,6 +3630,7 @@ fn llmulaccKaratsuba(
/// r = r (op) a.
/// The result is computed modulo `r.len`.
fn llaccum(comptime op: AccOp, r: []Limb, a: []const Limb) void {
assert(!slicesOverlap(r, a) or @intFromPtr(r.ptr) <= @intFromPtr(a.ptr));
if (op == .sub) {
_ = llsubcarry(r, r, a);
return;
@ -3699,6 +3700,8 @@ fn llmulaccLong(comptime op: AccOp, r: []Limb, a: []const Limb, b: []const Limb)
/// The result is computed modulo `r.len`.
/// Returns whether the operation overflowed.
fn llmulLimb(comptime op: AccOp, acc: []Limb, y: []const Limb, xi: Limb) bool {
assert(!slicesOverlap(acc, y) or @intFromPtr(acc.ptr) <= @intFromPtr(y.ptr));
if (xi == 0) {
return false;
}
@ -3761,6 +3764,8 @@ fn llsubcarry(r: []Limb, a: []const Limb, b: []const Limb) Limb {
assert(a.len != 0 and b.len != 0);
assert(a.len >= b.len);
assert(r.len >= a.len);
assert(!slicesOverlap(r, a) or @intFromPtr(r.ptr) <= @intFromPtr(a.ptr));
assert(!slicesOverlap(r, b) or @intFromPtr(r.ptr) <= @intFromPtr(b.ptr));
var i: usize = 0;
var borrow: Limb = 0;
@ -3792,6 +3797,8 @@ fn lladdcarry(r: []Limb, a: []const Limb, b: []const Limb) Limb {
assert(a.len != 0 and b.len != 0);
assert(a.len >= b.len);
assert(r.len >= a.len);
assert(!slicesOverlap(r, a) or @intFromPtr(r.ptr) <= @intFromPtr(a.ptr));
assert(!slicesOverlap(r, b) or @intFromPtr(r.ptr) <= @intFromPtr(b.ptr));
var i: usize = 0;
var carry: Limb = 0;