codegen_helpers.go

package compressor

// setNZCV32 sets the NZCV flags for a 32-bit subtract operation.
// Called from codegen as: { _v := uint32(rn) - uint32(imm); setNZCV32(_v, rn, &nz, &zz, &cz, &vz) }
// The second argument (rn) is the original uint64 register value.
// The result is the 32-bit subtraction result.
func setNZCV32(result uint32, rn uint64, nz, zz, cz, vz *bool) {
	*nz = int32(result) < 0
	*zz = result == 0
	// For CMP (subtraction), carry = no borrow: rn >= subtracted value
	// We can derive the subtracted value: sub = uint32(rn) - result
	rnW := uint32(rn)
	sub := rnW - result
	*cz = rnW >= sub
	// Overflow: sign of result differs from sign of rn, AND signs of operands differ
	*vz = (int32(rnW) >= 0) != (int32(result) >= 0) && (int32(rnW) >= 0) != (int32(sub) >= 0)
}

// setNZCV64 sets the NZCV flags for a 64-bit subtract operation.
func setNZCV64(result uint64, rn uint64, nz, zz, cz, vz *bool) {
	*nz = int64(result) < 0
	*zz = result == 0
	sub := rn - result
	*cz = rn >= sub
	*vz = (int64(rn) >= 0) != (int64(result) >= 0) && (int64(rn) >= 0) != (int64(sub) >= 0)
}

// fpExecSIMDCompiled delegates SIMD/FP load/store/compute to the interpreter.
func fpExecSIMDCompiled(x *[31]uint64, sp *uint64, vreg [][2]uint64, mem []byte, inst uint32) {
	// SIMD execution stub removed for standalone generic release.
	// Users must provide their own SIMD state tracking if needed.
}