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vvp: Implement vvp_vector4_t xor operator

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`vvp_vector4_t` has word wide in-place operators for and and or, but not
for xor.

Add `operator ^=` using the same internal word representation.

Signed-off-by: Lars-Peter Clausen <[email protected]>
This commit is contained in:
Lars-Peter Clausen
2026-05-06 13:19:53 -07:00
parent 8519a30354
commit 41c3423209
2 changed files with 25 additions and 0 deletions
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vvp/vvp_net.cc
+24
View File
@@ -1964,6 +1964,30 @@ vvp_vector4_t& vvp_vector4_t::operator |= (const vvp_vector4_t&that)
return *this;
}
vvp_vector4_t& vvp_vector4_t::operator ^= (const vvp_vector4_t&that)
{
// The truth table is:
// 00 01 11 10
// 00 00 01 11 11
// 01 01 00 11 11
// 11 11 11 11 11
// 10 11 11 11 11
if (size_ <= BITS_PER_WORD) {
unsigned long bval = bbits_val_ | that.bbits_val_;
bbits_val_ = bval;
abits_val_ = (abits_val_ ^ that.abits_val_) | bval;
} else {
unsigned words = (size_ + BITS_PER_WORD - 1) / BITS_PER_WORD;
for (unsigned idx = 0; idx < words ; idx += 1) {
unsigned long bval = bbits_ptr_[idx] | that.bbits_ptr_[idx];
bbits_ptr_[idx] = bval;
abits_ptr_[idx] = (abits_ptr_[idx] ^ that.abits_ptr_[idx]) | bval;
}
}
return *this;
}
/*
* Add an integer to the vvp_vector4_t in place, bit by bit so that
* there is no size limitations.
vvp/vvp_net.h
+1
View File
@@ -323,6 +323,7 @@ class vvp_vector4_t {
void invert();
vvp_vector4_t& operator &= (const vvp_vector4_t&that);
vvp_vector4_t& operator |= (const vvp_vector4_t&that);
vvp_vector4_t& operator ^= (const vvp_vector4_t&that);
vvp_vector4_t& operator += (int64_t);
private: